I got lucky and found a group that managed to complete it.
Overall, I'm impressed. The last two fights are definitely very hectic. I'd tentatively say the mechanics are on par with an extreme trial. Lots of thinking ahead and memorisation of patterns with only a few moments to figure out where the safe spots are.
I'm thankful it's not too punishing in terms of dying - we had a fair amount of deaths, though everybody was revive and we managed to win.
I hope we see more content like it in the future. Further refined.