This seems rather pro-worker to me.
Though he is of course very pro-business as well. Maybe the difference is that some people think you can be both?
Not originally. It was about operating a SaaS and charging your customers more. Straight from the man himself back in 2006: https://www.kalzumeus.com/2006/08/14/you-can-probably-stand-...
The pivot toward salary negotiation stuff came later, presumably because there's a much bigger audience for employee-directed writing on Hacker News than there is for startup founder advice.
This seems rather pro-worker to me.
Though he is of course very pro-business as well. Maybe the difference is that some people think you can be both?