Are you trolling?
It is absolutely possible to set the coverage threshold in Jest to 100% for all categories and they are set to that in the codebase I worked on. I would spend hours trying to that last 0.02% covered sometimes.
It does make me wonder why it would take you hours to do that though... was the code that complicated to test for some reason?
It's not ridiculous to expect some, *configurable*, amount of test coverage for newly generated code, is it?
He's a digital nomad who took off to Mexico (and Belize) and seems a bit lost in where he is going (he says it himself). I've been there myself (except I moved to Vietnam), so I understand it.
This is a lot deeper than just writing tests or 40% internal tooling issues. I also suspect that being remote, he feels like his hands are tied in a company that isn't used to working remotely. Or at least, if I was struggling with tooling, I'd work to find a way to make it better.
I also never complain about writing tests. I can't tell you how many times tests have saved my bacon or resulted in writing cleaner code.