nah he doesn't say it's motivating the trans identity.

being trans is mostly a way to claim a marginalized identity

Yes he literally is? He's saying this is the majority reason for "a lot" of people. I don't understand how you don't see this.

Using a marginalized status as a shield is something otherwise privileged people do fairly frequently.

Yea, and I have no problem with people pointing out specific times people do this. But that's not what he's saying. He's literally saying being trans is mostly a way to get these victim points, for a lot of people (specifically white shitty people).