Yes but Raspbian is also 'a weird variant of Debian' by that line right? I think you're in agreement with GP; I find a similar thing coming up with Arch & Manjaro (an Arch derivative) - for almost any purpose when someone says 'Arch' it applied to Manjaro too (just less often vice versa).

So, yes, 'non-Debian' which (Debian) includes Raspbian, not 'non-Raspbian' which (Raspbian) precludes Debian.

Yeah I agree, I consider Raspbian "a weird variant of Debian." They add a bunch of packages (some that override upstream debian) and they have some custom software, plus a lot of other customization.

Raspbian is probably closer to Debian than Ubuntu is, but it's still quite clear that you're not on Debian.

Raspian, RaspberryPi OS, Ubuntu etc are all known as derivatives of Debian, since they are directly or indirectly derived from Debian.

https://www.debian.org/derivatives/ https://wiki.debian.org/Derivatives

Ubuntu is Debian (architecturally), plus the stuff Ubuntu added, so I believe the latter is more practically accurate.

Raspbian is as well, which is why making the statement about it being weird on non-debian seems more apt (ha!) than saying non-Raspbian.