WIY -“I was told that Rav Moshe held that bizman hazeh there is no longer such a thing as tinok shenishbah so basically they are all meizidim of some degree. They know they are Jewish and they know that there is such a thing as being an Orthodox Jew and they have an obligation to pursue their heritage.”
That’s Not what I heard. I heard he held this about s/o growing up in the NY area. So anywhere else -it would depend on how much Judaism the person was exposed to.