Earlier quoted context omitted.
The real question is why people think Twitter's lost revenue is linked to Musk's management. There doesn't seem to be a theory about a causal link. If anything the argument is "Musk is a bad person -> Twitter lost revenue" which suggests his management practices had no effect on the company's operation.
FWIW, I absolutely blame his management of Twitter rather than his political alignment or questions of morality. Reason being, look at Tesla stock price: Musk's gaffes have a short term impact, but overall the price is way up since buying Twitter.
Musk used to dabble much more in Tesla directly than he's now, I wonder whether the ups and downs of the company correlate with his involvement, especially before he started going off the rails so badly? That would be informative and help separate object-level impact from political hysteria.