The mushrooms that the article talks about do not contain psilocybin (it's still not clear what psychoactive compound they contain), but you are correct in that DMT and psilocybin, at comparable doses, have extremely similar subjective effects.
Avid conosour of both DMT and Psilocybin and would not characterize the effects as “extremely similar”. Psychedelic yes, but profoundly different at their core in heroic doses—at least from my vantage point.
Just curious, nn-DMT or 5meo-DMT? I haven't tried either but have heard nn-DMT to be more the machine elves type experience and 5meo-DMT to elicit a feeling of not existing in the physical world anymore.
Usually when people just say DMT they mean nn-DMT (which is a lot more visual/weird and can bring on the "elves" at breakthrough dosage). 5-meo-dmt(/bufo) is much more of a felt thing, but can definitely have some visual effects (I usually get enveloped in the bright white light of god before dissolving into everything/nothing, ymmv).
Same vantage point here (with sample size n=1 on the DMT front).