This is of course, nothing but an arrogant and ignorant assumption fueled by your own limiting world view, which is broadly materialistic.
Why you would be interested in DMT at all, which deals with the supernatural, not just "the natural world" is beyond me. The world of nature is still being understood.
Why not control your ego, learn to not speak of things you are ignorant or have no knowledge of, and keep an open mind to an area we are exploring. While many superstitious beliefs are not based in reality, this is also true of many formerly scientific 'truths' that turned out to be nonsense. Black magic, though not something I have personally experienced, may have some psychic basis and to dismiss it outright especially based on psychedelics activation of the psyche is just a personal view you have and nothing more.
True skeptical enquiry is nothing like the sort of dismissals without due investigation you are spouting though. That attitude hinders true scientific enquiry.