We’ve heard this one in 2016.
He was a convicted felon who had the Supreme Court in his pocket who granted him immunity as well as an attempted insurrection in his honor and he saluted hostile generals?
I don’t remember if he promised to be a dictator on day one or had already praised dictators back then, so I’ll grant you that one out of…everything else he’s done since then which was not covered in 2016.
I’m not on Debian, but a quick search led me to this wiki link from Arch. Give it a whirl:
https://wiki.archlinux.org/title/GDM#Hide_user_from_login_list
Edit: context of the Arch wiki link, in case better answers can be gleaned from it, I found it on AskUbuntu: https://askubuntu.com/questions/2471/how-to-hide-users-from-the-gdm-login-screen