Weird that they didn't require any MFA from a second support // Admin account when dealing with account security settings for prominent accounts. That's not that hard to set up and makes these sort of things harder to pull off. Not to mention severe rate limitation on internal accounts. How many prominent accounts does one support person need to reset password or email per day? Not that many, I'd wager.
Imagine the potential damage if an attacker tweeted something on behalf of the US President (let's say Biden in 2022), that China or Iran or Russia ships could be sunk at any moment if they didn't withdraw (due to some ongoing real incident)... The other side might fire on US ships before the tweet could be corrected.
As you say, it would probably not work on foreign governments, but would be very effective on the general population. They could have used that to cause political turmoil (hopefully not enough to change something like elections results?) or influence stock prices etc. This just looks so uninspired...
