That is the fundamental observation here, that Vladimir doesn't take into consideration. A statement of possibility is a positive assertion, because all statements of fact are positive assertions. And all positive assertions must have some fact or piece of evidence to tip the balance to their side (otherwise it couldn't be a positive assertion).
An arbitrary statement is outside right or wrong statements; it simply is outside of reality altogether and has no basis on which to even be evaluated. That is the case with the "matrix" scenario -- it is not possible (if it is, show how), but is arbitrary (there is no basis for determining its truth or falsehood, and as such it must be thrown out together with all other infinitely many arbitrary statements). It should be stressed again, that the "matrix" scenario is not wrong, but arbitrary, which are two different things. There is basis on which to consider and evaluate wrong statements; there is none for arbitrary ones.
Free Capitalist got a reaction from Easy Truth in "How do I know I'm not in the matrix?"