Interesting. I definitely have an internal universe, but I've been trying for almost a decade to access it. Meditation does not work unless I'm on certain drugs, all of which that are legal having stopped working for that purpose. The only way I have found is to find another real person and actually describe it to them as I explore. If there is nobody else there, it is as if my internal universe does not even exist. Even my DID system seems to stop existing. I just become a completely empty shell unless there is somebody else around to observe me. In other words, it does not seem like it exists for me, but only to be observed by others.
I want to fix this, but I do not think that is possible...
Also, the technique recommended in the video doesn't sound like something I can do since I don't feel like having to explain the weird noises to the other people in my house.