One big development in "dance music" is the music coming from Africa. For example, Amapiano, Afrotech etc. So probably there are also still more subgenres popping up in areas of electronic music I do not follow/listen to.
Therefore I think your impression that their absence "...might be explained in part by Ishkur's own age / detachment..." is correct.
Scanning my local club pages I can confirm both Amapiano and Afrotech events! I also see something called Gqom.
They are the only unfamiliar things among a sea of the old familiars: house, techno, dnb, garage, electro etc. I see a fair amount of "Dark Wave" which is not electronic and not new but not a common term back when I might have been going to gigs.
Indeed. Check out the Nyege Nyege Tapes label for instance. Also the Príncipe label, which showcases the latin equivalent of this (often cross-pollonated with African styles).
Therefore I think your impression that their absence "...might be explained in part by Ishkur's own age / detachment..." is correct.