WSL2 doesn't use systemd as its init. Thus systemctl disable/enable X doesn't work.
I note that when installing minidlna, apt prints
Created symlink /etc/systemd/system/multi-user.target.wants/minidlna.service → /lib/systemd/system/minidlna.service.so presumably we can move/rename this symlink. Though likely minidlnad isn't loaded as a service even if this symlink is present.
Whether minidlna loads at all is unclear. So far as a DLNA server is concerned, if the client is Kodi and the server is Windows, just load Kodi and use that.