Actually the change is a nerf...
Keep in mind, 99% of the time he lands his Q on you it will be followed by a warrior AA, that's the point of the slow on Q, with that said, we got 15 extra damage on Q but 0.1 less AP scaling on his W auto attacks, so even his basic Q combo starts to feel nerfed at 150AP, and come lategame, where there's less Q poking, and more constant warrior auto-ing, it's a HUGE damage nerf.
In fact, from my point of view, they took this already weak champion, bugged him to hell and back in the last patch, and then suddenly decided to nerf him out of the blue, gg riot.