I read the WSJ story. They use normal rigorous journalistic standards, requiring corroboration and an editor's approval. They'd be sued if they didn't. No one's suing.
I also read Musk's reply.
First of all, I don't care if he's used illegal substances.
But he does hold government contracts and associated security clearances, so at least in theory Uncle Sam is supposed to care.
Musk's response:
- I've been drug tested for three years and haven't failed
But do drug screens test for ketamine for recreational use (he's prescribed it, so he'd test positive anyway)? For LSD? No. For shrooms? No. I don't even believe the latter two can be tested for.
In other words, no "I have not used LSD, shrooms, or ketamine (for recreational use) since my college days" denial.
Read between the lines. An admission.