It is obvious that the author is ignorant of the topic (psychotherapy).
It sounds like a hardware engineer dismissing software engineers and strongly affirming that all bugs can be solved with hardware solutions.
Some problems are indeed due to psychic issues and not physiological ones. Yes, you can probably workaround symptoms with drugs, but that does not really solve the problem.
If you have mental blocks and a shitty life that makes you depressed, and alleviate the depression with drugs, you still have mental blocks and a shitty life.
I wish that both disciplines were not as independent from each other as it is today. Having experts at both subjects could probably do wonders to help people and make proper progress.