It's obviously transphobic to blame the Minneapolis shooting on being a trans woman.
Just like it's obviously racist to blame the Antioch shooting on Blackness.
The Minneapolis shooter was radicalized by white-supremacist and Nazi content online.
She didn't become a murderer because she was trans. She became a murderer in spite of being trans.
Her manifesto was explicitly transphobic.
She detransitioned as a result of her radicalization.