There were a couple things that vanished from the Games Workshop webstore, as well as sections not appearing online. Just a heads up that there were Nurglings being purged from the systems according to the Facebook posts from GW.
Certain items were missing online briefly during this. It seems though that everything is back in order and I have not heard of anything else that is off or hints of new things revealed from it.
In other words....... No Nurglings can be found.