The bug still exists.
Asked him to buy one of his gems, he never answered (and he was not AFK, he changed zones, even got to Sarn Encampment for a while). Scam.
I've been farming Piety (Act 3 Merciless, Lunatic temple version) today, and I noticed she always repeats "Your devotion damns us, heretic!" twice. One time, then another time in a different tone.
I was playing a Templar, and it occurred every time she said that, and in every instance of the fights. Her other dialogs/taunts were not repeated, only this particular phrase.