With the Hagrid and Taiga topics being so active recently, I'd basically forgotten this exists!
URGH no, not you too. They are going as fast as they practically can, working to the programme that they have been for months now. They have known their target opening date for many many months now, they've not 'suddenly realised' they aren't going to open it in August.
The visible stuff from the outside may have slowed down, but they could be working like mad on the wiring and internal works that we can't see. Just because the cranes aren't moving much, or they aren't painting the big wall, doesn't mean the necessarily slowed down.