“I’m not accusing but you can’t call something that Rav Moshe is Matir that it’s treif.”
Treif wouldn’t be the proper word, but if people hold l’halachah not by the cholov stam heter, then they hold that it is assur and giving it to another Jew would be lifnei iver by them.
This same differentiation would be present between one who holds R”T Tzeis l’chumra vs. l’halachah for motzei Shabbos, or Shabbos generators in Israel, or shmitta produce, etc. If you hold something l’halachah, you can’t facilitate or benefit from other people transgressing it.