Since I was brought there I can attest ; I only tested briefly though but it seems to me that uhm is pretty much 2.5 bowa level in term of overall strength. Leveling to 125 is similar, it likely isn't as good for 120 rifts that isn't dunc and 125s rifts so might have a slower mid game farming, but since he rolls on scos, bosses and apparently do labs it balance out I guess. Anyhow I'd definitely add it on the list of overtuned, especially seeing that the build is supposed to be a tank.
Well it's always the same question, we and the devs gotta define what a balanced build is, and at each level what are the good bosses/rifts in term of difficulty. If warlock pal had it's powerspikes a bit earlier and were overall a lil bit better 1-110 I'd consider it the absolute perfect overall balance