The legal system still exists though and your changes would need to not be auditable or else you're going to get thrown in jail. And no matter how much you think you're smarter than the average bear, you're probably going to leave traces. And if Musk gets personally pissed off at some bit of particularly bad sabotage he's got enough money to hire some actual expert outside talent to manage the incident and nail your ass to make an example of you. Which he most certainly would do.
Employees interested in sabotage should not do anything stupid, they should just join the exodus.
"In the chaos of layoffs, firings, and resignations our security team was entirely gutted and as a result my login must have hacked by one of the literal billions of people on the planet with an interest in taking down this company, even if only for the lolz. The proof of our security issues, staffing woes, and public animosity has been extensively documented. Whatever traces of sabotage you may have found cannot reasonably be linked to me. ¯\_(ツ)_/¯"
Falls apart immediately when they get a warrant for your text messages and find you bragging to whatever human you have a sexual interest in or whatever.
And in general, all these "I'll just say <whatever>" arguments on the Internet will nearly always fall apart when you start backtracking under questioning and changing your story and they pressure you with evidence. Everyone always thinks that they're some kind of perfect sociopathic Patrick Bateman or Heath Ledger's Joker in their mind. You/they are not.
If you are relying on that argument, then they certainly have enough to arrest you and charge you, and the safe bet is that you'll crack.
[Also your argument gets much harder to make if they have you logging in with 2FA from an IP address that can be traced to your house or something like that--very hard for someone to fake that no matter how much fucked up chaos is going on inside Twitter]
Employees interested in sabotage should not do anything stupid, they should just join the exodus.
Fantasizing can be fun though.