Yes. This. There is even a screenshot of the waiting room screen on the official ticket blurb they issued.
I'm pretty sure you'll need to refresh manually BEFORE 1800 to effectively 'join' the waiting room.
Once you're in the waiting room with the countdown to sale start then LEAVE IT ALONE!!!
Well I've spent the best part of 1 hour trying to see if i overlooked the 1975 when trying to listen to them the first time around.
The answer is no. However, if they were to headline, as i have said, all is not lost as there are about a billion other stages
Also.................Got to get a ticket first