Also has his own website http://www.viridiandreams.net/ that alludes to a chapter 43 on Patreon (ugh) but I don't know if that one ever made its way to FFN.
He doesn't update there or anywhere else anymore because he doesn't have his passwords to do so. You must have not gone through the threads in his site. Nightmares of Futures Past was on more than FF.Net and Jeconais' site.
I don't even remember what this story is about, honestly. FFN missed a few auto-update emails, but chapter 18 was released in 2012 (!), so one chapter per 3 years since.
Does it count as an update when you're referring to an entire site rather than a single work?
With the passing of its creator and owner in March 2020, the Harry Potter Fanfic Archive (hpfanficarchive.com) is shutting down and its contents being moved to AO3.
The Harry Potter FanFic Archive will be closed to new and updated works from 12 December 2021, and the site will be permanently closed down on 31 December 2021.