I had somebody from the Disney communication group call me (twice because she wanted to double check to be certain) and confirmed that the parade viewing is included with the terrace package only, as is on the current website descriptions. She acknowledged there are issues with the "know before you go sections" and indicated she was going to advise the web group. There is now a little bit of wording in the terrace section that says something along the lines of checking back prior to the event for specific times. You can take that for as official as you want, but I believe it's he most definitive info to date. I'm assuming at this point that it's true and will just continue to monitor. The 1st parade start time will be the confirmation, IMO, since it will need to be earlier than the usual (non parade viewing years) 9:15.
I will add that when I booked the dessert party in 2016 with parade viewing, they did send an itinerary to me a week ahead of time with specifics on where/how to check in for the parade and the logistics of moving to the dessert party/fireworks viewing. I would assume, if what I've noted above proves true, that they will do something similar this year.