People keep focusing on the Regulos kill and ignoring their Matriarch exploit. Even if Trion didn't consider their "creative use of game machanics" an exploit on Regulos they still would be guilty of exploiting a prior encounter required to even access Regulos. LoS'ing a boss to negate all tank/raid damage so the mob just stand there and doesn't attack is a textbook example of exploiting.
I would also like to note, since some people seem to misunderstand the thread title. The NQ kill was not world first, it was NA first and the only reason there is even a distinction is because Rift doesn't patch NA and EU at the same time.
They exploit then taunt the community with trolls and griefing then get butthurt when the community demands action be taken. They made their bed and Trion is making them lie in it.