Interestingly, Rav Moshe himself doesn’t seem to follow his rule completely. In OC 1:39 he seems to say that Min Hatorah anything relating to Kedushah needs a Mechitzah. But if I recall correctly in his T’shuvah about a co-ed book club that wants to give a D’var Torah (“Meeting Shel Society; I think it was in OC 3) I don’t think he requires a Mechitzah (I could be wrong about that though as I have not seen that T’shuvah in a very, very long time).
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