Over in the GD thread about this, Jazz noted this comment in Wudijo’s video on the subject:
This was my take on it:
This would explain the results fairly well. You basically do infinite damage, so you don’t need damage buffs. You have to know the bug is there, it’s not accidental (otherwise, why open a rift that high with that character). And, you also (probably) have to not quite know how to reproduce it, otherwise, why not just go to 150 right away?
So, sounds like maybe they just play till they find the bug, then everything dies. That 150 didn’t go down right away might be due to needing to find a 2-floor map, and produce the error on each floor, or something like that.
Of course, the other likely explanation is that they somehow figured out how to have a 2 or more person team play the rift, and then close it just as a single player. Then, all you need is one or more good Inna Monks with you. But, it would be strange that such a thing would only work with the GoD set.