In a way, I agree. Twitter's moving into an era where they have way fewer people but also huge pressure to release a bunch of changes on nightmarishly short schedules. I guarantee there's some senior tech lead who's just been handed a "make $8/month blue checkmarks happen, you have two weeks" assignment.
In an environment like that, "rock stars" who can knock out projects in short order are going to see their careers skyrocket. But the trick is, they're going to pull this off by taking every shortcut they can. Code reviews are out, refactoring is out, performance and scalability concerns are out, etc. They will successfully launch the thing and then flee to the next glorious launch opportunity.
This will work very, very well for a while. The thing about taking on a lot of debt is that it allows you to accomplish big things in short order. But the debt will be hidden, and over a year or two, they will start to find that suddenly getting projects done is becoming nearly impossible, even compared to the pre-Musk days. And things will slowly fall apart.
It might be that all of the technical debt they're about to take on will have been worth it. Debt's a tool, and maybe making big changes to adjust their company's heading is worth it. And maybe to Musk, it's VERY worth it, because technical debt doesn't show up on financial ledgers, and he probably wants the company to look as solvent as possible.
But I wouldn't want to be a software engineer there in a year.