As far as I know it’s only some mini bosses (that have shielding), not the rabble.
As far as not cc’ing I’ve run NFS more times than I care to count on multiple characters, my style of play has never been an issue. This is a change of some sort IMO.
More to the point the toon that I experienced this on has never had an issue deleting these same packs previous to the last patch day.
Just the facts. And Delves do get changes without it being documented outright, happens all the time.
I’m not here to argue with any of you, I’m here to gather information on what I experienced.