So basically adding 30 levels to a mob now makes it hard-mode end-game NM content by OP's logic. But really, what I see is people getting 2 lancers together and gimmicking the hell out of lv70-80 grinding content (no doubt due to lax mechanical design, although I'm sure the purposeful non-increase in bonus SP given for the kill was completely worth creating a thread full of rage about).
If these r80+ mobs were actually meant as r50 "hard mode" content, it would have been not only specified somewhere but also rewarded in kind... but sadly this is not the case: they are just mobs :P
If people decide to clear the mobs to pass time while SE fixes the game, great. Just don't try to claim that it is meaningful or even legitimate content