The assumption that the entities have any interest in doing one's bidding is an interesting one, and seems to be an unavoidable design-flaw in these types of experiments.

And, as far as numbers go, there's always the wildly improbable chance that someone "just guesses" correctly, even though it appears to be informed by a dmt-vision. I would caution against regarding this as "irrefutable evidence" regardless of the improbable nature of such an occurence.

You could say there are clear flaws in both directions, or put another way...

Perhaps this sort of verification is not the purpose for which these compounds are best utilized.

If I can gain insight into myself about things I was previously missing in my behavior, mindset, surroundings, etc., that would be veridical, by definition, no? So it seems to me that there is already an answer to the question, which is a clearly resounding "Yes!" Perhaps just not in the vein that the OP limits itself to.

Look through the experience reports here and elsewhere and you will find an overwhelming cache of evidence of veridical epiphanies and insights.

And in the narrower vein of the OP. I've seen "impossible shapes" and machinery that I feel like I could never have dreamed up, not in a million years. But how do I know I was incapable of dreaming it...and if I can see the shapes, are they truly impossible? How much of "me" do I really know? How much of "ourselves" does any of us truly know? Making this delineation seems damn near impossible when you are both the observer and the altered, eh?