Earlier quoted context omitted.
I don't know what they're saying over on /r/lsd, but psychedelics can break you out of repetitive negative modes of thinking, giving you insights that last after the high is long gone. LSD is a tool that can work in in conjunction with other tools and changes you make in your life for some people some of the time.
key word being /can/; it's a statement and a belief that IMO is very sensitive to confirmation bias. One of the key points of the psychedelics / soft drugs legalisation effort is that it would allow for a lot less red tape to do medical research on.
Are you saying people who no longer feel depressed are suffering from confirmation bias? :)