No they haven’t confirmed it as far as I know. Yes they probably never even knew Jews existed. That is why they are not even a consideration!!!!!!!!!!!
The third time:”Rabbi Miller’s statement was not that every person that ever existed anywhere in the world believed in Har Sinai. It was that no one ever denied it.”
The second time:”when throughout history, throughout the western world, in spite of the tremendous, pressing reasons to deny Har Sinai, by almost every culture (maybe not the zoarastrians) and they did not, yes it indicates acceptance, it indicates they viewed as a fact, not something to wonder about.