Two part answer:
(A) Yes, Hoop Dee Doo Revue SHOULD be available to book at 180+10.
(B) I say SHOULD because there has been something unknown going on with HDDR reservations lately. My 180+10 opened a few weeks ago; I went on at 6:00 am at the 180 day mark and it was showing no availability for any show for the entire week; a week and a half later, same thing. I don't believe that for a second. There are multiple threads on here with people questioning the same thing. Some say it is a yet-to-be-announced rehab; some are speculating that they are going to be going from three shows to two, and Disney hasen't released times because they don't know yet how that'll all shake out. Apparently this weekend they just opened up a boatload of times for September, which coincides with what others have been saying that they are doing it month-by-month right now (essentially opening up booking the month before). I'm still holding out hope, but am prepared to go into my February trip without a HDDR reservation (which would make me quite sad).