This is the basis of their whole article:
Wow! Objective science! Two whole people and a 'suggests!'
The rest is a speculative lead up, and followed by a politically correct social justice rant worthy of the World Workers Party quarterly newsletter.
Yes, of course, this is why I always characterize the belief that one is the opposite sex to that indicated by
both one's genetics and external morphology as a delusion, and ask why that delusion is treated differently from any other (as another poster observed when I posted my view, we do not issue gold epaulets to people who believe they are Napoleon).
There is a very rare phenomenon called complete androgen insensivity that results in genetic males (XY) maturing in female form (always infertile). If such a person had a deep-seated belief they were male, they would present a case in which the female-to-male "sex-change" surgery procedure would be appropriately applied (though I'm not sure it could be called "sex-change" in that case).
I am perfectly willing to regard "transgenderism" in case where chromosome and morphology disagree, or morphology was ambiguous at birth, as a condition that should be regarded as a condition that should be treated with compassion, probably including accepting the person's feeling as a basis for resolving which sex the person should be regarded as being. (Perhaps not surprisingly, since I am an Orthodox Christian, and the one definitive statement issued by any Orthodox Holy Synod on the matter is that which I hold. cf. The Basis of the Social Concept of the Russian Orthodox Church, issued a few years back by the Holy Synod of Moscow.)