I mean, he is. Non-ironically.
The closest (real) thing to this "deep-state" boogeyman of theirs is the Federalist Society, and the people who drew up Project 2025.
These are real organizations that conspire to circumvent the checks and balances that are supposed to protect the rights of the people in this nation, and the rule of law.
And while I don't believe that Trump is at all involved in organizing these conspiracies, he has been more than happy to execute their wishes in exchange for power. And knowingly so.
So yes, Trump is part of the deep state. Factually.
Just for comparsion, that would be like surrendering Alaska, Texas, and California if we needed to surrender 30% of our territory "for peace"