If you notice on the link you provided Scrubber IV is listed as a related NPC on the sidebar. Also the Project 1999 wiki pages for both the quest and Scrubber IV point to a connection between the two.
http://wiki.project1999.com/The_Gnome_Take
http://wiki.project1999.com/Scrubber_IV
Though those both seem a bit incomplete. But from what little I can recall of playing a young dwarf rogue on live many years ago, I could of swore it was Scrubber IV on there as well instead of one of the generic unnamed Clockwork Scrubber place holders, but obviously I could be mistaken on that. So some confirmation would be nice on this.
I sat in the spawn room for about an hour or so this morning with "/say 628" set in a social macro to spam each time something popped up in the room and started their pathing and nothing ever responded, though that could have just been a string of bad luck on my part. While there I saw Duster V and Scrubber IV each twice and several of the generic Clockwork Scrubbers. A new one would pop up every several minutes, in that square room in the palace on the way down to the king that matches up with the coordinates given for Scrubber IV on the wiki.