While I mostly agree, it looks like the fair amount of the article is about his attitude.
Something that was a bit surprising was the combative tone that Calibre's lead developer Kovid Goyal took in the comments on the bug. Rather than working with Donenfeld to see what the problems were, he dismissed most of the bugs as invalid. Even after Donenfeld tried to further point out the problems, Goyal was rather sarcastic in response:
You mean that a program designed to let an unprivileged user mount/unmount/eject anything he wants has a security flaw because it allows him to mount/unmount/eject anything he wants? I'm shocked.
This does not appear to have changed if you look at his responses to issues. I linked the tmux stuff in a different comment (same root).
Both skills and personality can chance a lot over a decade and I'm glad you're not quick to jump the gun. We need more people like that. But given brash comments over the past few years, it does not seem like this part has changed. He's been working on kitty for 8 years and has only accepted minor PRs and is dismissive of user issues.