Just realized that when I installed my very first install of EndeavourOS, the last beta before release, this happened. And I was just running the installer as is, obviously; no Net installer to screw up.
I assumed that’s just as it was supposed to be, it being a beta and Eos being closer to Arch anyway than say Antergos or Manjaro.
…But was it? Was it supposed to identify as “Endeavour” and not “Arch” even then? in that case this has happened to me twice, with several months apart on two different computers and two different installers.