I am not on Aradune as you could tell pretty early on it was going to be a garbage low pop server. It has the 2nd lowest population of the TLPs since phini at this point in the expansion releases only slightly higher than Coirnav.
This made me curious so I took a look: according to the various progress pages, Phinny had 19 guilds kill Vulak in era, Coirnav had 13 guilds , Mangler had 12, and Aradune has 18. Hard to know what that means and guessing at population always seems hard. Of those I only did Phinny and Aradune in Velious and the population of EC tunnel seems much lower but hard to tell. Maybe only the reasonably serious stuck around on Aradune given server issues? Plus everything is headed towards easier/more knowledge so those that are around are more likely to raid.