what exactly is technical about personal attacks?

Didn't Linus famously say that he regretted his behavior, that making things personal was not okay, and that he needed to change some of his behavior?

>like linus lol

I am not even sure if that is an insult.

Linus attack on "things" he dislike and call the person out on it. I don't believe Linus has ever call out on that person's other non related behaviour.

People keep using Linus here as if they are the same. They are not.

What is the behaviour that Jarred was called out for that was not related to Bun?

Being a bad manager. That’s a very personal attack.

if he actually was, then it's not a personal attack but stating facts about a person - there's a meaningful difference.

A personal attack has no informational value (about the accused), while bringing to light bad qualities of a person does - especially if those qualities are related to the issue at hand, which in this particular situation seems to be the case.

Again, the distinction between a personal attack and proper characterisation of bad qualities rests on actual facts i.e. was it slander or was he really a bad manager?

I don't know but I personally give less probability to the former than the latter.

Managing a very public project that advertises Zig and doing so poorly is a matter of fact, is it not?

That was what ZSF try to implies. And would have been much better if it was written as such. But the way it is currently framed is a personal attack.