There. No drugs, just reflection, same result. And there is something to be said about experiencing something you know intellectually to be true. And then there are people who don't come to such conclusions through thinking; I dare say even if it's "just" tripping your balls off, a lot of people could use such an experience. Maybe not this particular one though, that seems a bit heavy.
Also, what is "impaired cognition"? Compared to what, exactly? I mean, what makes thinking you're person A with attributes X and Y and possessions Z not impaired cognition? They're both "just in your head", after all, and the view that "there is just everything" seems to be closer to what we know so far about reality, than our nonsense about individuals, nations and corporations. I mean, just because you call something a chair doesn't mean there is such thing; it's just practical and we don't think much of it, so we divided "whatever this is", into a trillion of such concepts, none of them able to withstand examination, but taking on a life on their own in our imaginations. They kind of become our masters, and I'm pretty sure letting go of all such delusions in one big go feels awesome, and a bit of "gobbledygook" is to be expected... just don't mistake nonsensical utterances with not understanding them.