I don't get how you are coming to the conclusion that this guy wasn't valuable? I know nothing about him but based on his website [1] he seems pretty accomplished:
- I started an agency called Ueno. I ran it for seven years before it was acquired by Twitter in 2021... - At Ueno we designed digital brands and experiences for companies like Airbnb, Apple, ESPN, Dropbox, Facebook, Google, NY Times, Oculus, PayPal, Uber, Venmo, Visa, Walmart, and many more - ...And let's not forget I was person of the year in Iceland in 2022
Also, Twitter was not almost bankrupt before Elon bought them, that is silly.
I'm frankly not sure why Twitter needs to own an entire design agency (presumably they've acquired all the staff) especially in 2021 when their design was already set in stone and hasn't changed significantly since then (so indeed, what has this guy been doing?).
Now, I'm not defending Musk here and especially not this childish reaction - he should be following the accepted protocol for making employees redundant instead of cutting them off and laughing at them publicly on social media.
I'm not sure I'd want to work somewhere that's actively drawing management strategy from Office Space.
Looking at his tweet however https://twitter.com/iamharaldur/status/1632913642982191105, has Twitter's design changed at all in the last 2 years, let alone for good, to justify any of this was actually valuable? It's the same UX shit-show it turned into since their last major redesign several years ago and has all the flaws of "modern" design which is making up for lack of functionality and attention to detail with copious amounts of whitespace.
Again, not blaming the employee - if he was allowed to run around for 2 years not contributing anything, it's not the employee's fault but a problem higher up the chain. But his role does sound bullshit.