This patch did not seem to stop farming, came across a group of them in the Vinedeath instance, they were circled around the mob, and in the 4 tries I tried to hit the mob I only got him once. How did I know they were farming first, there routines seem to be the same, they did not move from the spot, also the name of one of the mobs was gibberish. Yep this patch helped a lot, for legitimate players trying to tag boss mobs.
Another one I saw was the spider queen, one group was using a knockback, to get the queen out of the tag range of other players then used multiple characters to smack it, before I could even target and get something off.