kyrios doh, it was Snap. Ok, but I seem to recall this being the command to remove Snap apps the last time I ran Solus 3? But it throws argument.
sudo eopkg remove snap tusk
Password:
Package snap does not exist. Cannot remove.
Package tusk does not exist. Cannot remove
Edit: it's "snapd" so I have Snap removed, but Tusk I still can't figure out how to remove.