In an XFCE desktop session, typing the following results in:
$ echo $XDG_CURRENT_DESKTOP XFCE
So, this shouldn’t be the cause of it.
Edit: Adding the following line to the
.desktop entries hides them from the dmenu prompt:
For now, I am utilizing this method for uncluttering the dmenu entries list. However, if someone has a better solution for hiding these applications, or disabling them in an i3wm session, or even mass-removing them without breaking some obscure dom0 dependency on those, I am open to hear.