The Sleeping Beauty Castle Walkthrough has indeed closed (temporarily of course). One of my on the spot reporters was at the park yesterday, & the attraction was indeed closed, with the sign put back up on the entrance & exit doors.
I'll vouch for that it was indeed closed at least on Thursday. There were reports that Tony Baxter told people it would close the Monday after Thanksgiving weekend but he did not say for how long. So maybe they just needed a day and a half or so to finish up and were not ready to do that work on Monday, since I read it was open at least this past Monday and Tuesday.