auto attack lines would only proc twice if both hits would count as an ‘auto-attack’ but that doesn’t mean that it’s a fake multi hit. It could be an auto attack and then a second hit by itself. Auto attack lines only proc on the actual auto attack hit, but the followup could then proc a full blessing or any other property as well.
It needs to be properly tested. I suspect it works this way, because if it’s a proper fake multihit then it really is just an attack speed boost.