In english you can use “they” if you dont know the persons pronouns

You can, but you can also use “he”, as English has a masculine generic.

But valid point, Debian is weird

I think that most Linux distros are based on Debian these days, as Fedora, the other major “parent” distro, seems not to be doing super-well, so I’d guess that most distros are probably using the sudo group.

https://distrowatch.com/images/other/distro-family-tree.png

Slackware looks not very alive these days, so I don’t think that there’s much going on with the child distros there any more.