I'm not sure he's wrong. I'm speculating here but I can imagine the kind of developers Proton attracts--likely people who care a lot about the code and who care about the craft. That's fine, but when you're running a company in this environment, and that's what things look like internally, you do have to be a little brutal to shake people out of old ways. A manifesto titled "Your old job is gone" may actually be warranted.

It sounds a lot like there are people internally who are still fighting the shift, and they've taken to leaking things that hurt the company's security image. Part of the CEO's job, if he's going to push hard in the direction he's decided on, is to fire those people who will undermine it before they do. That this has all now backfired is entirely on him. Maybe he thought he was "motivating" people by calling them losers, or shaking them out of an outmoded way of thinking about what we do, but none of that matters when you have employees attacking your main selling point and the core image of the company in public.

He's not wrong that he needs to move fast, or that processes need to change, or that the job has changed, but his execution isn't so great.

He'll probably survive just fine though.