@atomicpoet Short answer: no she is not.
Long answer:
First, how are we supposed to rework Twitter when we don't have any control over it?
Second, much of what she mentions are features, not bugs, of decentralization. Much of the rest are fundamental misunderstandings of Mastodon and Fediverse in general; most servers, be they general, math, or Equestria related, aren't going to ban you for talking on an off topic subject, either just with people on their server or with people on another.
Third, there's no restriction on having multiple accounts on Fediverse (I have two handles in active use, one that I am going to migrate to my own instance, and a few others that are inactive or redirected).
Fourth: even if Mastodon has issues, there's other ActivityPub software out there. I'm planning to use Akkoma for my personal instance.
I get the feeling she spouted this without doing much if any research, and thought that she could get away with that because of her degree.
@mathlover @atomicpoet #KarenNorth actually said this about #Mastodon #Fediverse:
"It's decentralized. So if you want to go in and you want to cover the news in Ukraine but you accidentally join a server that's all about My Little Pony then what are you going to do?"
Shiver me #Twitter's