https://www.warcraftlogs.com/reports/aA4kHhNQbgJ9P2WX#fight=56&type=damage-done
This guy was using both T6 talents: Exsanguinate and Agonizing Poison.
Bump. Was just about to create a thread but stumbled upon this one. The top 4 rogues (at least, I didn’t check more) all exploited. Check the first guy (chinese) for example, the boss is debuffed 99,87% of the fight with Agonizing poison, but he uses Exsanguinate 7 times, and he is the only rogue in the raid. Exsang Tier = Ago Tier
This fight in particular (8 seconds in, casts Exsang while Agonizing Poison is on the boss, which is clear evidence)
https://www.warcraftlogs.com/reports/VBNJQYzmLW7bvjZ6#fight=1&view=replay
Links to the reports, and I can invalidate them.
https://www.warcraftlogs.com/reports/VBNJQYzmLW7bvjZ6#fight=1&view=replay (same as edit in my post before)
https://www.warcraftlogs.com/reports/CrV3ZPgkvnFTK1Ba#fight=3&type=auras&spells=debuffs&hostility=1 (2 rogues,
both exsang specced, agonizing poison still debuffed on the boss 99% of the time)
https://www.warcraftlogs.com/reports/rjzybaC4Fk63Hct2#fight=1&type=summary&source=19 (2 assa rogues, 2x exsang, agonizing debuffed from both of them)
The list is probably much bigger than this, but thats it for now, can post more tomorrow.
Edit 2:
Korean Player, solo rogue, exsang & ago poison on boss:
https://www.warcraftlogs.com/reports/gd2vYyrX6TmxPzBV#fight=22&view=replay