No, I'm not assuming that at all. Not least because it's led to this clearly unreasonable outcome. What I'm assuming is the Luc has been caught up in poorly thought out legislation that was designed to prevent trans girls from competing against females. As I said, this kind of hard-line position is a consequence of how unreasonable this conversation has become.
The issue, as you point out, is that some people think trans people should only be allowed to compete with people of the same sex (not gender). This is not the same as saying that trans people shouldn't be allowed to compete. Again, Iszac Henig, the trans boy who beat Lia Thomas a couple of weeks ago, competed with female athletes, by choice, and was allowed to do so because he hasn't taken any hormones yet. As I said, we should stop pretending that this is impossible.
Saying "nobody is against trans people competing in sport" will turn off readers who have become so determined to believe that they're hated that any suggestion that they aren't, is treated as an attack. But the problem is that hatred and disagreement have become synonyms in some parts of the trans community. Especially online.
I've seen first hand how mean people can be on both sides of this debate. I've seen the hateful language and the unreasonableness from trans people and transphobes. But the issue is that it's so hard and nasty trying to have a conversation about this, that people just dig their heels in further and further. This is why you get stupid, nonsensical situations like the one that's affecting Luc.