Maybe chip on their shoulder, but the claim of conspiracy theorist is completely unwarranted. The impression you give off is that you decided upfront their sources are bad and you're going to knee-jerk reject their evidence no matter what.
I will say if you search for "chemical imbalance debunked" as discussed, the first result for me is a paper that also says dyslexia cannot be proved to be a disorder. Which just from vibes feels really conspiratorial, even without making comments on the veracity of the academic paper.