There are a couple of mobs in this game that sit in chairs like this: Forgall the necromancer in the Weeping City of Mhach, and Strix the librarian in the Great Gubal Library (Hard).

So, no, not a sign of Pandemonium Warden - though it is very likely that Forgall's and Strix's models in this game were adapted from PW and the other Dvergr models from FFXI.