I put autistic for that tweet is because the entire anime/manga not once mentions about gender identity issue, it's just romcom between a tomboy and dense male crush. Nor even having Tomo claim herself as "son" or "man" like retards take on Fate Modred and One Piece Yamato.
Somehow enough to make him thinking about "anti-trans", he should take some time off from internet and culture war. This is coming from me, guilty of gaslighting topic about culture war related to trannies-troons appropriating character.
There isn't any trannies trying to appropriate Tomo, even retard take from
Screenrant is that how Jun treating Tomo like a boy is similar to misgendering to troons and "gender euphoria" with wearing female clothes.
He is also missing so much on which retards appropriating characters. Tumblerina troons will take male characters and head cannoning them with breast scar. While male troons just take any traps, especially ones are still straight, so they can larp as lesbian troons.
His follow up tweet is at least a bit more valid.

But to be fair, it's Japanese media not Western, so girlboss writing is not really a thing. Tomo isn't the first and only one either. This whole thing just reeks of clout chasing picking on flavour of the season anime for internet slap fight point.