Swami Narayan was a mayavadi

Swami narayan exposed as a non vaishnav

Prabhupada objected to the line of Siksha-vadri. Siksha-vadri is a book from the SN sect in which there some anti vedic statements. Prabhupada was made to hear one of these. There it self SP started his refutation of that text. The statement was, Na vaksyam sarva-tamasam yajna-sistam abhipacchet even if the vedas say that eat meat after it has been offered to the krishna in a vedic yajna still one should not eat meat. SP said that is a refutation of the authority of the veda. The eating of meat which is offered in sacrifice to krishna is the necessary item for the very conditioned jivas who cannot at once give up meat eating and are gradually weaned off those habits and inclinations. SP classified anyone who did not accept the vedas a buddhist. 

Prabhupada: That's... You see? He does not know what is the scheme of Vedas. You cannot stop meat-eating all of a sudden. But you can raise some restriction. These rascals who are meat-eaters, if you say, "Don't eat meat," he'll never do that. Therefore, "Yes, you can eat meat, just after offering to the goddess Kali," and in this way, that means, once in the month, that means restricted. Restricted. So, Vedas means they're taking gradually, not that, like a foolish, "You don't do this." You cannot do that. That is Vedic authority. The Vedas are meant for everyone. Those who are meat-eaters, you cannot stop them all of a sudden. Similarly, drunkards. You cannot stop them, drunkards, "Don't drink." They'll not hear you. Therefore restriction. "Yes, you can drink, after offering to the devi," and that means restriction. So what is the meaning of marriage? Because sex like the cats and dogs, stop it. Just get married. In this way, otherwise, you may say "No marriage." Just like, the other day these sannyasis come, because saw woman was sitting, they'll not enter. But I saw their teeth was so unclean, and the dress was never washed. But they have got this restriction, no seeing of woman.

analogy
If you in your house dont practice extortion, confinement, execution does not mean that you should dictate to the state that they should not have jails or give capital punishments or demand fines. 

self defeat of SN

 Vetas pi pavitranam svadhinam ca tasam api, vedanam ca na kartavyam nindha saddhya

Prabhupada: But why he's making ninda? You don't eat, even it is... Now in the first you said, you don't..., you cannot kill animal, even if it is...

Here this sloka means that they are not supposed to criticize the veda where in the first sloka itself it says that dont accept meat offered in yajna even if it mentioned to do so in the vedas. So this is foolishness.

"As soon as you say api, even if it is enjoined in the Vedas, don't do it. That means decrying the Vedas"

The devotees are forbidden to eat meat but that does not mean they can deny the vedic injunction which say that meat can be offered in yajna. That statement of SN was going against the veda and subsequently saying that the vaishanavs should not eat meat. 

1. the vaishanavs should not eat meat. this is right.

2. the vaishanavs should not eat meat even if it is written in the veda. this is criticizing the veda  

Prabhupada: We are not advocating meat eating. You do not understand. We are saying that even if you don't eat meat, you cannot decry the arrangement in the Vedas. That you cannot do.

Here SP is quoting the dashavatar stotra 

nindasi yajna-vidher ahaha sruti-jatam

sadaya-hridaya darsita-pasu-ghatam
kesava dhrita-buddha-sarira jaya jagadisa hare

Prabhupada: You'll see, it is stated, nindasi yajna-vidher ahaha sruti-jatam. Sruti-jatam is the Vedas. There is recommendation of sacrifice, but you have decried them.

Indian man (4): He has not decried them. Devatam, devata te ta vi pranam sadvinam ca satam api, vedanam ca na kartavyam ninda svadya na ca tapi.(?)

Prabhupada: Hm. So this is ninda. If you say, "Even if it is recommended in the Vedas," that is ninda. If you say, "Even if it is recommended by the Vedas," that means Vedas are mistaken. You are right. You do not know what is the purpose of Vedas.

Indian man (4): What is the purpose of Vedas?

Prabhupada: The purpose is gradually to bring them...

Indian man (4): But he...

Prabhupada: ...not that all of a sudden that you say "No, you cannot eat."

SN is also like that

Prabhupada: This is going on. But disciples say that Aurobindo is more than... This is their knowledge.

Giriraja: That means he's failed as a guru. He hasn't...

Prabhupada: He could not give them right knowledge. Phalena pariciyate. The pariciya is to be understood by the result. The disciple is the result. If they are so fool, then what is the guru?

Dr. Patel: Vaisnava-parampara, Vallabhacarya, the whole lot is now. I have seen it.

Prabhupada: They are criticizing us.

Dr. Patel: This thing is the God has to reincarnate Himself again to reestablish bhagavata-dharma.

Prabhupada: That is everywhere. If you don't mind, your Swami Narayana is also like that.