It's hard to understand any rationale for this, particularly sense the message said that Twitter did an investigation and found that you had violated Twitter rules, indicating that actual human beings were part of the process and not an algorithm. Given that an actual investigation took place, it's a bit more than just infuriating. Nothing you said was the least bit problematic, so whoever conducted the investigation has to be a really terrible human being. They have to be viciously transphobic themselves.