I think you are ascribing a little too much to this move. It might be because most of our cable providers in Canada had Netflix on their set top boxes then actually relented the other direction and created their own VOD platforms.
I see it less as a "move" and more as a very late to the game failure on Comcast's behalf to get their own platform off the ground. When you are one of the last TV platforms to the party it seems more like Netflix has made the final checkmate then the other way around.
It's not like Comcast purchased a stake or bought Netflix, that would be insanely newsworthy.