I do have an update on this issue. This change was intentional, and we'll be adding it to the patch notes. Bosses in Story Mode Operations no longer drop Black Hole Commendations in Game Update 1.4. Thanks to everyone who brought this up, and we apologize for the confusion over it.
This is yet another in a string of mind bogglingly dumb ideas. If you want to gate content by gear, that is fine. But the least you could do is go the full way in copying the WoW model and make the previous sets (through campaign) easier to get as the new set (dread guard) comes out.