Musk has no incentive to be truthful here anyway. He's in the middle of what could end up being one of the most embarrassing failures the last 50 years. Destroying a 44 billion dollar business in 3 weeks through sheer, unadulterated hubris and incompetence. There's nothing people love more than watching people fall from grace so I have a feeling that folks will remember this.
Certainly plausible that twitter could survive without significant downtime, but it seems unlikely at this point: it appears Elon has been taking big reckless actions and he'll need to rapidly pivot to smart measured actions to keep infrastructure from tipping over.
If it weren't true, why would there be a hundred articles a day about it, and a US President announcing in a press conference that Musk's connections to foreign governments should be investigated?
Over what timeframe? If only recently, are people joining just to rip the piss, and play with the muskovites?
There are others who want to avoid his product because they don't approve of his behavior.