I'm not sure what conclusions one can draw about the broader NPM culture by reading a single-sided Twitter thread from a disgruntled former employee tweeting about how he lost his job.

I only made it through the first ~10 tweets before clicking out, so maybe there's something I'm missing further in the thread. But to me, it just sounds like what you'd expect from someone being laid off.

It's a little weird that he didn't have a manager who would wish him well on his way out. But that's about it. The bit about a severance with a non-disparagement contract is absolutely standard, not out of the usual whatsoever (especially for a VC backed company like NPM).