Sorry but I don't see how that and supposedly being a druggie objectively adds up to someone being the most successful businessman on earth twice over.
Let's try this a different way. Yes, Musk had a lot of success early but his last few years have been rough on him, which corresponds to the time period that he had allegedly increased his drug use. SpaceX has largely continued to do well, though they are having issues with Starship. Tesla is having a very rough time, with sales down around most of the world (such as Europe where Tesla market share has dropped to half of what it was last year). At the same time, despite Teslas issues, the stock has still doubled in price over the last year, even if down from six months ago. As such, even if Musk hadn't done anything in the last year, his net worth (based on SpaceX and Tesla stock) would still be substantially higher -- particularly as it appears he is getting new federal contracts from the Trump administration.
But the fact Musk is going through a tough patch, where the Cybertruck (which is allegedly his pet project that he heavily influenced) has flopped, is a reason a "successful" man would have a drug problem. The issue, from what I can see with Musk, as things have gone downhill, Musk has become more "frantic" in trying to solve issues with his companies. Worse, on top of that, he was doing his DOGE work as well.
The claim is that Musk has always used drugs to help him when he really needed it but, prior to the "crisis" of the last couple of years, used them sparingly -- using them only when he needed an extra push for a day or two to push a project back on track. What is claimed no is, given the "crisis," Elon has been using drugs constantly because he's had so much to do and felt under so much pressure to get things done. Musk does seem to be one of those people who believes he has to fix things, that he is the only one capable of ensuring everything get accomplished. So, since his body only naturally can work so much per week, Musk has used drugs to push his body and mind beyond what it can normally do, so he can work three days straight without any real sleep. But, because of the major issues, it wasn't just one three day period he needed it (like in previous times) but that he constantly needed to put in those longer hours over weeks and months -- particularly when he started working DOGE on top of trying to ensure that the issues with Starship kept getting improved and that the
Tesla Taxi (particularly the self driving) could be launched.
This is exactly the type of situation where someone highly successful (not to mention extremely competitive) can have major drug issues, in the attempt to keep their success (and winning) going.