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Yes. However, many kernel modules needed to boot on a modern macOS machine are proprietary.

If an os is partially oss but functionally closed, what do you call that?

If I run windows with apache web server, is windows now open source?

rMS is a zealot, but it doesn't mean he's wrong...

You can, or at least could 5 years ago or so (and I bet you still could now).

However, it involved finding some random blog post on how to do it, and then even once I got it up and running there were some issues like the fans being pegged at 100%. Still, it was mostly functional.

I can speak to that via scuttlebutt from ex-apple friends. Apparently the intel power management code running in macos includes proprietary code from intel that they weren't comfortable opensourcing, for weird reasons.

There was an attempt to make a complete FOSS OS on top of that - PureDarwin[1][2]. It looks dead now though.

[1] http://www.puredarwin.org/

[2] https://github.com/puredarwin