Zwiftinsider isn’t run by Zwift - he just reports on them (though he definitely has inside information, and they work with him on various things, like letting him use “bots” to test various functionalities).

That is pretty old. I think there are several approaches now. The one he lists, one using docker (I actually had it running on my desktop Linux machine, but I didn’t actually test it), and I think some people got it working under WINE.

Zwift’s saving grace is that you can connect most hardware via your phone - trainer, cadence, heart rate monitor, etc. - because it’s designed to also run on things like Apple TVs, iPads, and Android phones and tablets, albeit with probably lower graphics settings. So, you don’t need to worry about the hardware end of it (ANT+ dongle), which very much simplifies the issue. Which reminds me, my heart rate monitor is ANT+ only, and I’d need a bluetooth-capable one to do this.

(Also, at worst, I could run it on my tablet and hook that up to a monitor, so even if I can’t get it running on Linux, I still have options.)