This doesn't answer the question. I'll ask again: why is it necessary to discard experience as real? One simply needs to accept that at a later point in time it might be shown not to be reality. Until that time, accept it on a pragmatic basis. To the degree you understand what the experience might be. As much doubt as one allows. You seem to be under the misapprehension that for something to be tentatively held one needs to understand exactly how it might be shown to be false? I don't see it that way. One merely needs to accept that it may be shown to be false. One otherwise accepts only a tentative trust in the matter, e.g. on a pragmatic basis. Of course. In the Matrix, who is to say that the metareality is any more or less real than the one being experienced by the population at large? Unless one can eliminate every possibility of something being wrong, there remains the possibility. That is all it takes. One doesn't need to identify every way, or indeed any way, for it to be shown to be wrong, one merely needs a mindset that allows for it.