"It shows that depression is something chemical, that it can be reversed with chemicals, it dispenses for once and for all that you can just pull your socks up."

This is entirely an assumption, and shows nothing conclusively. Just as an experience can trigger a depression (see @JPKab) an experience can cause it to end. There's no reason to look at a human being as a walking slab of meat for the sake of analysis.

This says nothing about "chemicals", and I'll bet you can find many of the same benefits are attained by people who are able to achieve similar experiences using meditation or other techniques.