They aren't running FreeCAD from 2002, they are running FreeCAD from 2020. I bet you couldn't run 2020's Firefox on a system from 2002, even though Firefox existed in 2002.
Well, it did about 2-3 months ago when I found the system - an ancient Dual 3GHz Xeon (Nocona era) with 5GB of ram - and pt Win7 on it just to see if it would work.
It was even fairly usable.
Some software that needed more recent CPU instructions (~SSE something?) didn't work, but Firefox seemed ok.
Interestingly, no modern Linux distribution was able to boot. Wouldn't even get into the installer. FreeNAS 11.2.<something> booted and worked fine.