Absolutely. He has publically endorsed doing ketamine as a method of managing depression. Elon is doing ketamine, and I think he's doing lots, from all appearances.
How do you know what he’s doing? Even if he’s said something positive about it and/or used it in the past doesn’t mean anything. I have positive things to say about psilocybin but haven’t done it in 20 years.
So if he's just endorsing its usage in a clinical context, that is way different than railing lines.