As I’ve written before, R’ Moshe’s statement of b’shaas hadchak was only for one specific case – a yeshiva which was thinking of switching from buying CY to buying CS. The Rosh Yeshiva wrote to R’ Moshe asking his opinion, and R” Moshe said only b’shaas hadchak. This was a reply to a yeshiva which was buying milk for many yeshiva students, and had only been using CY milk for years. It was not a teshuva intended for the general public.
As usual, Joseph likes to take teshuvos out of context to fit his agenda.