Earlier quoted context omitted.
So, by this use of this word, it is discrimination to prevent (non trans) male athletes from competing in female sports.
Yes, absolutely. Any time you distinguish treatment between different categories it is discrimination. That's what the word means.
Chuck "discriminate" into Google and you'll get two definitions:
> 1. recognize a distinction; differentiate.
> 2. make an unjust or prejudicial distinction in the treatment of different categories of people.
I was referring to the latter use.