I'm with you on this, I just built a (much more modest than the article's) workstation/homelab machine a few months ago, to replace my previous one which was going on 10 years old and showing its age.

There's some folks in /r/homelab who are into this kind of thing, and I used their advice a fair bit in my build. While it is kind of mixed (there's a lot of people who build pi clusters as their homelab), there's still plenty of people who buy decommissioned "enterprise" hardware and make monstrous-for-home-use things.