I said it happened in the past, not that there was people taking videos of it happening in the past. You said it yourself that it was used in the past, I just clarified that some servers actually used it quite a bit to grief each other. As I interpret your quote you said that its little use in the past didn't quite make it suitable for taking action, even though its still an exploit. Now since its being used again its grounds for review and taking action against those who do. Like I said I'm fine with this I just find no reason to why an exploit that can be used to reset just about any boss at any stage of the fight was overlooked when the developers had knowledge of it, other than the fact that it was "rarely used for resetting bosses".
I never said "its little use in the past didn't quite make it suitable for taking action, even though its still an exploit" you have misinterpreted my post.
We
have taken action against players for using it in the past, it however was not as prevalent an issue as it is
currently. Hence the recent need to remind players that we will take action if caught doing so and reassuring those affected.
We have always planned to fix the issue, it's more recent usage has just called for it to be bumped up the priority list.