I’m not sure if all psychological problems are brain problems, at least not at any level that we can interact with at a meaningful level yet.
Example: let’s say you had a moderately abusive parent. The result is low self esteem but nothing diagnostic worthy. While I’m sure there’s a concrete neurological effect that might be measurable, but I seriously doubt that neuroscientists would have the tools today to interdict and make a difference in the way that psychology might.
Now I do agree that neurology is replacing psychology, I just don’t think it has replaced it yet.