perhaps 5,776 is from the time people were raised above the animals. this si the world as we know it.
That description doesn’t fit what it says in Bereishis.
there are other poskim. Perhaps the “halacha” (I find it difficult to write that about a non-legal matter) is not like him.
Perhaps the halachah is like him, even if you don’t like it. (I am speaking theoretically; I don’t know whst he holds.)
How is determining who is accepted for geirus not a legal matter? This is a fallacy of some on the left, dismissing hashkafos as not halachic, despite the fact that there are clear halachic ramifications. Don’t fall into it.