What makes you think he connects to the 6th or 7th dimension through meditating? Not saying he doesn't, but I'm curious if there's any evidence to suggest this. I mean, have you experienced DMT yourself? I constantly see energy at night, though it does not compare to the conscious foam of a much higher dimension.
I feel that people who meditate to this level are more inclined to have a state of awareness and connectivity similar to DMT or psychedelics, but I can't say I've heard of people inducing full out trips. Well, I take that back sort of, I have had points where I could make myself trip slightly, form patterns out of the grass and such, by focusing my mind to do so. But still, to reach an equal experience of DMT through meditation would be quite the feat I imagine. I'm sure it can be done, but I would sure like to know about a human that has that ability.
Just to give you guys my limited experience of DMT, it basically channels a spirit of great intelligence. In the presence of the spirit, one may feel intimidated or unworthy just by the presence of such a divine being. It's not something to be abused, but it is there for you to explore. I used it three times in a row when I first tried it (not on the same day). The third time, the spirit was angry with me for overindulging without true spiritual purpose in mind, it made it quite clear that it was not to be used as a recreational tool but only when you truly seek wisdom and self evolvement.
I have only 'blasted off' (completely left this dimension) on one occasion. From my experience, it's actually a lot easier to handle when you go all the way through to the other side then when you're still hanging on to this reality. My experience of blasting off was quite divine, rather than shooting out of my body, the hyperspace came to me. I could feel my soul winding through a neighborhood of souls (some would prefer to call them spirits, but I like to say souls in this instance). I felt a true connection with each entity I encountered, it was as if I was visiting people I have known in past lives. We were happy to have felt each other's presence.
It's truly a life changing experience and so long as you go into with an open mind, you will find much growth and understanding within your own consciousness. And with understanding comes peace.
Note that my experience is not a blueprint of what it will be like. I have heard of someone entering a world where they could create things with their mind, like a lucid dream. I also experienced this, though what I was creating was what looked to be a wall of hair-like energy. I have also heard of someone experiencing nothingness or dark space, which boggled me at first but just proves that what you experience is truly based off what you believe to be there.
Anyways, don't mean to rant, just wanted to share for anyone who may be interested. If you want a new perspective, if you want to find purpose, if you want to believe in yourself, if you want to transcend beyond this dimension, if you want to see the true nature of the universe and consciousness, I recommend trying it at least once.