Daas Yochid,
After re-reading that teshuva, I see what you quoted above, but it seems to me that the context is concerning a Yeshiva and not the average person. When R’ Moshe says “??? ??? ????? ??? ?????? ???? ???? ?????? ?? ??????? ??? ??? ??????” which Yechidim is he talking about?
It seems to me that he is talking about people that want to be machmir on themselves. He is saying that even then they have don’t have to be strict with themselves.
I don’t see anywhere in this teshuva that R’ Moshe reconsiders or contradicts what he says in his earlier teshuvot, where he says that a ba’al nefesh should be machmir. In fact, one could say that the Yechidim in the Y”D Chalek 5 are the baalei nefesh in Y”D Chalek 2. So that it comes out (according to this understanding) that R’ Moshe is saying that even a baal nefesh, who lives way out of town, may rely on the chalav companies.