The footage used in the KI YouTube video was filmed just prior to its closure. There are certain unfortunate indicators in the footage that it was near the end of its life - most notably the condition of the attraction's animatronics. The park edited the footage from the ride too, for instance, the levitating dress does not appear because in its final 2 seasons someone had ruined it with fake blood. Adding the blood was a poor choice made by someone that wasn't smart enough to realize the ride was designed to be tongue-in-cheek, not macabre.
Prior to the closure, DAFE, as well as ACE was invited for tours. Most of the figures had been removed by the time of the ACE tour. There were also several "personal" tours given, both before it was deconstructed as well as after the transformation to Scooby had begun.
Final rides on Phantom theatre were done by the general public. I was in the 3rd to the last car. The final 2 were filled with employees that worked on the ride.
Here's some fun, abeit dark & overexposed pics of myself and friends playing around with some of the props during an individual tour we took before PT was removed and during another tour as it was being converted to SDATHC...