This is a parallel
It's only a "parallel" in the sense that feminists colonized Marx using the specious similarity between class struggle and "gender struggle"
however you have not just XX and XY, you also have XXY and XO and all those weird outliers
Chromosomal disorders are not a justification for a field of sociological study. The vast majority of gender studies doesn't even focus on chromosomal aberrations in the first place, so I find it highly disingenuous that you would even bring it up
You are gonna have to elaborate cos thats a bold claim with no backing
you claimed it yourself right here
"its a field about how people express themselves and identify themselves with things, and how these identities impact societal power structures"
At this point it's barely even about sex anymore, it's about the expression of identity, since the word "gender" has been butchered beyond the point of recognition.
It's accurate in the sense that "gender" refers to kinds of a thing, so in a warped sense yes, gender studies is an accurate term for what's going on, since it's become an infinitely broad field completely lacking in coherency, and therefore has access to an infinite range of kinds of things
Or perhaps a linguistic shift that allows a new mode of thinking
that "new" mode of thinking is literally just chaos
it surprises me that gender theorists even attempt to have a canon, since it's impossible for any thinker to accurately convey what gender theory actually is; since it's all completely idiosyncratic, a thinker simply regurgitates whatever they personally believe, without regard to reality, and then other people will follow it because it pumps their intuition and makes them feel a certain way
there are no threads to follow, there is no sense to be made, no logic, only infinite grains of sand