Absolutely, but as I briefly said in the OP, the truthfulness of the belief is irrelevant. As far as the believer is concerned, they have experiential justification for their belief. This undermines any sort of comparison between them and other royal flush holders. From *their* perspective, everyone else is cheating and they know because they have this experiential justification with the hand they possess.
"It is the mark of an educated mind to be able to entertain a thought without accepting it" ~ Aristotle