I think what's changed is that Twitter is 1) an established thing, rather than something Musk built up and 2) not really tech.
Tesla, SpaceX, Boring Co have ambitious objectives with clear right/wrong answers. You put something in orbit or don't. Your car goes 500km with 70kWh of energy or it doesn't etc. You can inspire smart engineers to work hard to meet ambitious goals that require creative thinking.
Twitter has none of that, it is more like a club. Having the loudest speakers or brightest lights isn't going to make your club the best club. There is a certain baseline of technical competence required, yes, but mostly its about attracting the right crowd (being extra nice to some people, kicking others out) and making sure everybody has a good time. Musk might have actually succeeded with this using his previous person, but his new culture warrior schtick isn't gonna work.