I don't know what American LLMs you're using. Just asked Claude, which gives nuanced answers on both, but amounts to "It's contested, but numerous authoritative bodies say yes" and "it depends on your definition of gender".
when it comes to topics like genders, "it depends on your definition"
when it comes to topics like democracy and freedom, western definition is all you must depend on
well American censored LLMs that usually willing to take extreme efforts to convince me that there is no genocide in Gaza.
the same American LLMs also insist that there are many human genders.