I'm not saying it did. I'm just pointing out that 5 does not equal 6.
I am, however, very curious about the one-hour gap between park closing (6 pm) and party beginning (7 pm). Sounds to me like they might be going back to the "clear the park" strategy they used in the early years. If that is the case, it would be a significant change to the value associated with the party ticket. Instead of allowing admission for 8 hours (4 pm to midnight), it would mean that party guests only get access for the 5 hours (7 pm to midnight) they're paying for.
To my mind, that would be consistent with other decisions management has made concerning hours, staffing, attractions and special events. And to be honest, it's hard to explain to day guests why someone on a special event ticket gets three free hours in the park during the 9 hours of regular opening, only to be unceremoniously thrown out at park closing so the party crowd can have "exclusive" access.