He seems to be in limbo regarding that… From the article:

An Arizona school district has barred a teenage boy from boys’ sports teams, gym classes, and facilities

She said that the district also removed Laker from an all-boys gym class and have mandated that he use a separate restroom.

Sounds to me like he gets to use neither.

It’s worth reading the entire article by the way. The fuckery in the details makes it worse.