In case it helps, I think the original post was not meaning to say that the mind is not chemically based in the brain. I did not see it as a contradiction in their position.

I think their use of "chemical" was part of an assumed dichotomy between chronic disorders referred to in pop-culture as "chemical imbalances" versus other (learned or cognitive behavioral) disorders which could presumably be unlearned. The difference is mirrored in the assumed intervention: whether a continuous maintenance dose of some drug is needed to manage the chronic condition versus a transient dose or other therapy which allows the brain to assume a healthier posture and maintain itself thereafter.