147: Then you should have presented them as such and not as your own. And even so, I stand by what I said. If R’ Moshe himself didn’t mention it when he said that Chalav Stam (“Hacompanies’) counts as not being Chalav Shechalvo Akkum then no one else really has a right to come by later and say that you shouldn’t rely on this during the AY”T.
And the reason is pretty Mevuar. By Pas Palter there are two acceptable Minhagim. The Poskim just have a caveat that within the Meikil Minhag is included being Machmir during the AY”T. Here it is a question of whether this milk is included under the title of Chalav Shechalvo Akkum, which is always Assur to drink. Thus, by being “Machmir” on that during the AY”T one is either pointlessly buying different milk or admitting that he is Over an actual Issur D’rabannan all year round, Mah She’ein Kein in the case of Pas.