The rebuttal cited no studies. It asserts that the manifesto's claims about gender "flies directly in the face of all research done in the field for decades", and as far as I can tell this is utterly false.
What's great is the next sentence: "But I am neither a biologist, a psychologist, nor a sociologist, so I’ll leave that to someone else." So, you know it is false, completely, and that we should ignore it because it is false, but you are unqualified to provide any examples? Sigh.