It's a logical extrapolation from the 80-hour work weeks and huge number of people fired.

If they're not burning out yet they will be. You can't gut that much of an organisation in one go and expect it to still function.

They've made performance improvements since the layoffs. It's clearly functioning fine.

You know this how?

Look at the users comment history, literally the whole first page is only him nonstop defending musk in different threads. Wish I could post that pic of weird nerds protecting elon and his companies from valid criticism

There's a difference between defending Elon and calling out bullshit. There's plenty of legitimate reasons to criticize Elon. Making up things that are entirely unsupported by evidence, and with strong evidence to the contrary, is tremendously exhausting to read all the time - so yes, I comment and point it out.

An 80 hour work week is over-work and will lead to burnout.

I'm not sure what evidence you're looking for, you can take Elon at his own word that he is expecting the remaining employees to shoulder significantly higher burdens than normal. You don't build bedrooms inside of an office when your employees have a healthy work-life balance.