The rema himself brings 3 rishonim how hold like that.
Is that the Rem’a, or a later comment? I’ve never quite figured out the parentheses. Either way, if you count the Rivan, Rashi, Mordechai and Or Zarua, it’s four.
By the way, rumor has it that Oreos are completely pareve, not even keilim, but Nabisco doesn’t want to lose a warehouse full of packaging in case they ever reformulate to dairy. This would explain the different designations on different packaging.
And although I don’t eat Oreos because of pas Yisroel, I’m told that the more expensive versions of the heimishe brands are just as good.