Bimchilas K’vodo to R’ Wosner, who is far above any criticism I can ever give, statements like this (especially specific statements) end up hurting people who it affects. There are ways to encourage not talking during Davening without making promises like this. Because, unless R’ Wosner is saying that he had a Nevua guaranteeing this (which I would believe if he claimed), how can he say this with absolute certainty?
