Sam2,
You are right. I put him in there as I thought he had the same opinion as the M’B very strongly supporting before Shkiyah. He does bring that is probably the p’shat in the Shulchan Aruch and Tur (ie bein shamashos after shkiyah) that says Erev; however he concludes.
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Now I am not sure does that mean to not rely for example if a minyan is starting after shkiyah or if one has tzorech to daven after. Or if even if l’maaseh it is after shkiyah and b’shogeg or b’anos it occured, one should rather not daven Mincha.
He mentions before the minhag to push off mincha until after and brings a limud zchus. Also, his concern by the Rambam is interesting because Bais Yosef does not seem to even have concern for it (as he wonders himself).
Good Catch, Sam.
DQB