As another user said, it’s just a random blogger that said this.

Musk quote:

I mean, I think the honest answer is that we’re going to have to upgrade people’s Hardware 3 computer for those that have bought full self-driving, and that is the honest answer and that’s going to be painful and difficult but we’ll get it done. Now I’m kind of glad that not that many people bought the FSD package.

Musk says that replacing all the computers will be “painful,” and he is “glad” that “not that many people bought the FSD package.”