The
tl;dr is that Twitter and other big tech sites are very complex & finicky, and so Twitter was going to crash-and-burn very quickly after Musk fired a whole bunch of employees.
...Well, almost an entire year has passed, and Twitter looks fine to me!

Sure, Musk is a dumbass for trying to rebrand it to "X", but that's not an
engineering problem. You could maybe point to the rate-limiting thing as a problem, but that's a deliberate choice since Musk was annoyed about Twitter getting scraped by other companies for AI-training. Otherwise, Twitter seems to be operating fine from a tech standpoint. Marcan's prophecy didn't come true. Woops!
I think the reality (which wasn't even a secret) is that old Twitter was run like an adult daycare, with a bunch of failsons & faildaughters lounging around at Twitter HQ - collecting salaries but not doing any real work. I don't even like Musk, but he clearly made the right move in firing them. Marcan didn't understand this for some reason, but he was too arrogant to admit he was wrong. So he just deleted the sperg-out later and didn't say anything.