The assistantships and fellowships in science, engineering, and math are largely grant funded. The grants are secured from outside entities by faculty members. The students working on these grants (via assistantships/fellowships) are temporary (length of the grant) University employees.
An overwhelming majority of the graduate positions are purely merit (academic performance, research interests, and prior experience) based with no regard for gender. It is true that women have started to overrepresented in some of these fields, but that is simply due to more women choosing these degrees (and attending college in general), not a sex based/biased selection process.
I'm a big supporter of Title IX. It has provided a lot of educational opportunities to women via sports that otherwise wouldn't have been there. That in my opinion is a great thing. All that being said, revenue from NIL (compensation for the university generating revenue through tv and other marketing avenues) should be split in an equitable manner based on the amount of revenue generation of each sport.