When they first announced it (internally to themselves - in their heads probably) ... I guess Sky has that 5:30pm slot, so first that's what it was then the swapped with TNT slot and we're only finding it out after that shuffle has already taken place ...When was it ever at 5.30pm?
Usually TV companies pick it, send to PL, who send it to clubs, they can agree or object, they check with their local police arrangements etc. and confirm back to PL ... who confirm and announce it all. So that's when that back and forth took place behind the scenes.