The information for Debian on https://plasma-mobile.org/get/ is inaccurate
Starting with Debian12/bookworm you no longer need to add a third party repo for plasma mobile https://packages.debian.org/source/bookworm/plasma-mobile Mobian also recommends installing some other packages alongside plasma-mobile that Debian doesn't install or recommend so a link to the desktop environment page for Mobian might also be a good idea https://wiki.mobian.org/doku.php?id=desktopenvironments