The benefits and salaries that Twitter employees get are just the free market at work. Google, Amazon, Facebook and Apple don't pay big bucks and give huge perks because they're liberal, they do it because it's the only way to retain talented employees.
The take is hypocritical at it's core. Musk himself is an extremely privileged billionaire. Under the same principle that Musk deserves his wealth, Twitter employees deserve every penny of compensation and every hour of time off that they get.
Musk doesn't get that. He's going to utterly fail because the engineers at Twitter have other options. They don't have to work there. They worked there because they were getting competitive benefits and salary. Musk is cutting that just because he doesn't like the rate. Ok, fine, but don't be surprised when your company falls apart and you can't hire anyone as a result.