Microsoft is known for its MiStakes, the biggest one of course being Windows 10, and I think accidentally revealing a premier support (now renamed Unified Support) update is certainly up there. Microsoft's Security Update ISOs from 2010 to 2013 had several Windows 2000 updates that obviously weren't meant to be publically released; unfortunately this method of update distribution ended in July 2016.
Since it was released in July 2019 and is a non-security update, it probably falls into the same category as the Windows 2000 updates and wasn't meant for public release.
The Unified Support sales number is 1-800-426-9400. Not sure how useful it will be though. Other than that, I found a reference to per-incident support (https://support.microsoft.com/en-us/help/4341255) but you need a M$ account to access it. For that, I guess you could say "my chain of supermarkets in Casablanca has the wrong time on their POSReady machines" and see what they could do for you, though I don't see anyone buying that.