Not sure you are understanding what I am saying here. The leak states 9th - 11th July (not including the Sunday with the small epilogue as you call it) this would then be the 9th to the 12th. The mad cool dates stated in their new video say 8th -11th (they don't add the Sunday again) this would then be the 8th - 12th.
Yes Mad cool used to be 3 days, it was then turned bigger and into 4 and then back to 3 last year and then now back to 4 this year.
Just stating it now makes the text with the Leak incorrect, still does not mean that it won't happen. Hell it might even end up even better than the leak.