I’m not sure there’s anything to debunk. Many people have claimed that if you watch WofO and listen to DSotM at the same time, you get a trippy effect. Many people have tried watching and listening concurrently, and found that there is a trippy effect. I’ve only ever heard one person claim that the album was created to sync with the movie, and he was a complete loon. For most people, though, the music and the visuals complement each other, and it’s silly to claim that it “doesn’t work” because of a few instances when the lyrics could have supported the action, but they didn’t. The overall effect is still enjoyable.
The staffer being so adamant that they don’t synch seems to me like trying to “debunk” chocolate. You can explore the reasons why chocolate has the flavor and texture that it does, but what it comes down to is, most people like the taste of chocolate. And you can catalog the coincidences vs. the non-conicidences in DSotRainbow, but what it comes down to is, many people think it’s trippy. So be it.