Nope, that's not right. BPD can't be treated with CBT (comorbidities may be, with caveats if BPD is the root cause), you probably will also need at least DBT.

Is "almost everything" a bit strong? Should I have specifically mentioned BPD and schizophrenia (which I though were the two exceptions I thought people would most likely mention, there's bound to be a few others).

I coild argue that DBT is kind of just a variant of CBT, and while it's generally got evidence of being more effective there's credible sources suggesting CBT is effective (even if it's not quite as good). But nah.

I know there's exceptions. I said there's exceptions.

Can BPD even be treated with talk therapy? That's all LLMs would be used for afaik, it's not ever going to have a long term plan for you and check in

Yes, afaik BPD is the only Cluster B diagnosis with documented remission rates, when using a mix of therapies that normally are based around DBT.

Not sure what you refer about "talk therapy" in this case (psychoanalysis, maybe?), as even CBT needs homework and check-ins to be done.