I read a post on Reddit(?) where they say that some stores (GC or Sweetwater) were told to pull the items from the shelves, and in another post someone alluded to a problem with units overheating which leads me to believe that the issue is with the Battery in the G10T, as all the Line 6 Wireless Systems that are using non-sealed batteries (G30/50/75/etc.) are still being sold and only these with sealed rechargeable are not... for that matter I also saw that the Boss units WL-XX which are very similar to the G10 family also have a note of having "delays", there is only 1 system like, this that I can see still being sold Sennheiser XSW-D, but none other... except for the cheap systems...
This issue seems to have started in December, so my guess it has nothing to do with the Corona-virus which is affecting many manufacturers (like the company I work for, in electronics and not only in China as they are part of the supply chain of many other countries), but likely the virus effect will just exacerbate the delay in resuming production/shipments even if they have found the issue root cause and have corrected it in the design.
I know I am speculating, but the signs are there...
FWIW, I still want the G10S and likely will wait... don't want to shell out $400 for the Sennheiser... I like the functionality of the G10S and the price tag is easier to digest...