I'm not privy to the news on this particular fact, but the fact is that Ketamine IS used medically as an anti-depressant now, just at far below the dosage range

I'm not privy to the news on this particular fact, but the fact is that Ketamine IS used medically as an anti-depressant now, just at far below the dosage range to get "high". So if he's just endorsing its usage in a clinical context, that is way different than railing lines.