That's a bit ridiculous. Buying Twitter for $44bn was entirely his fault (and I think, a very stupid decision) and he does seem to be running the company into the ground, but were the fundamentals of the business solid before he got there? Did it ever justify its share price? Is ad revenue a sustainable business model? Was it going to remain profitable for long enough for someone who bought in e.g. 2020 to make a good return?

If you go to market and buy a lame horse then flog it into the ground, that's entirely your fault, but it's not like the horse was ever going to race well.