Perhaps it's wishful thinking on my part, but it doesn't sound all that reasonable to me.
It seems odd that they would have cast previews, then run the attraction full blast all day Saturday the 20th and all day Sunday the 21st, then close it down entirely for a week and a half until the 30th. Especially since it's basically a movie theater attraction that requires very few cast members to operate it. I'm guessing that it will operate at least part of the day during the week of September 22nd.