Link to actual study: https://jamanetwork.com/journals/jamapsychiatry/fullarticle/...
Many people only read the headlines and assume that psilocybin is treating depression. The reality is that these studies psilocybin as an adjunct to 11 hours of traditional therapy.
These studies aren't showing that psilocybin is a promising treatment for depression. They're showing that psilocybin-assisted therapy is a promising treatment for depression.