new to Debian-Sid / Server Admin. KDE-plasma creates user logon I cannot delete.

Hello Team Debian.
I am the System Admin of a small network in which we use a modified version
of Sid (Sky1) on a CiX 8180 RADXA Orion O6. By default Sky1 uses GNOME but
I prefer the KDE Plasma Enviroment. However during the course of changing
Desktop Enviroments, i made a typo and instead of installing the
"kde-desktop" package i added "plasma-desktop" and once installed this
package created a login "plasma-setup" with a password unknown to me. I
have tried deluser and userdel, i have tried to change passwd, but neither
of these worked. its user 1100 and its home directory /run/plasma-setup
doesnt appear to exist. i am slightly concerned that this could create a
backdoor into my system which contains sensitive ip information. I am
hoping that your team might be able to help me resolve this issue.
thank you for your time and attention to this matter.

Joshua McGoldrick
PSYAI LLC