Ok, I installed the mod and tried fighting him.
The worst part of his kit is that 1000-hit anime combo in the OP. I have no clue how to avoid getting clipped by that, but the rest of his attacks are pretty manageable rollslop.
Also, this fucker spawns an extra one of those homing arrow AOEs per target, so Revenant's summons are completely useless against him and having them out at all just makes the fight harder.