This is true to some extent. I'd say it depends on the severity of the case. Yes, sometimes you depend on strong guidance from a doctor, because your brain is just completely out of order. But this is never the full and only answer to the source of the problem.
For clarity: I think telling people with depression to experiment with hallucinogens is fucking dangerous.
Also: cost = $30 for 1 dose + testing kit; compare that to the price of months/years of meds (this should be relevant especially for US citizens which do not benefit from a sane/affordable health care system). Not to mention their oftentimes heavy "side" effects which can even become permanent, such as the loss of libido, etc.