Like I said, it doesn't matter what arguments the left comes up with. These days science can be paid to produce what ever results you want. Science can and is influenced by political opinions.
I am sure that an class in advance biology would validate your opinion but if you go back 10 or 15 years ago it would not. It wouldn't say anything at all other than there are two genders.
Facts haven't changed, just people opinions.
This all started with postmodernism. Postmodernism came with the false premise that truth is relative and not absolute. Once enough people begin to buy into this concept then 2 + 2 can now equal whatever you feel like it should be. It doesn't have to be 4. It can be 83,742 if that is what you want. Because that is "your truth".
Unfortunately for the postmodernists, facts don't care about your feelings. Truth is absolute. To make truth relative is an untruth. Men and women are assigned their gender at conception. What ever idea they come up with after that is not the truth. Even if you can find a "scientist" who says it is true. And we are a nation full of "scientists" who are paid to start with the conclusion and work backwards to find the "science" to make that conclusion seem like a reality. Then the media comes along and finished it by calling anyone who disagrees a "science denier" or they say "the science is settled". It's all bogus. It has always been hard to put all your faith in science because new discoveries can blow away old ideas. For example, it may turn out that the big bang theory soon will give way to another theory. This is already happening because science is never settled.
Finding out about new genders is not a scientific discovery. Had it been, it would have been something we would have known about for centuries. Fads are not science. One day this multiple gender fad will all be a distant memory. But for now the left is pushing it very hard.