It's only a
30 minute difference from when they normally open the Park for Magic Mornings.
Disneyland routinely opens at 8:00AM on weekends, during holiday periods and school breaks, and during summer. Magic Morning begins for guests with Park Hopper tickets at
7:00AM four days per week and it is only Fantasyland and Tomorrowland that are open that early. A couple thousand people show up for it on those mornings though, so it's still popular.
On the one day of the Miley event they opened the entire park 30 minutes earlier than they would have normally opened for Magic Morning. If anything, it was a big bonus because it wasn't just Fantasyland/Tomorrowland and it gave folks an extra 30 minute jump on the day.
This type of early Magic Morning operation has been routine at Disneyland for years and years. But then Disneyland has dramatically longer daily operating hours than Magic Kingdom does, so perhaps this is just a cultural difference between California and Florida to be upset at a theme park for opening early?