Ah, ok, that makes sense.
Though, I'd think the term "Punching Bag" would be more applicable there!
Exdeath's AI in the English version has indeed been improved. He still sucks, mind, and makes the best dummy to beat up on for EXP but, well...he does more than Teleport and occassional Almagests/Grand Crosses now. He'll actually use his counters, even High Guard (no sure about Omni Guard.) He'll try to use Black Hole if you're far away sometimes, and I've even seen him attempt Reaper Sword (...why, I don't know; Reaper Sword sucks when its not a counter.)
also, Teleporting itself is a lot faster, and causes Stagger, so it puts Exdeath into a neutral position, instead of constantly getting him countered and eating crits in the face.