It holds that probability and statistics deal only with random events, and that probabilities are merely the long run average frequencies which would be found in repeated random trials. On this view, probability is intrinsic, a fact which owes nothing to anyone's knowledge or ignorance. This explains the orthodox rejection of probability theory. But an intrinsic probability could hardly be changed by a mere change in someone's knowledge. An intrinsic probability would be whatever it was no matter who knew what, like the distance to the Sun.
Intrinsic probabilities require, suppose, and depend upon intrinsic randomness.
An example will illustrate the issues. I shuffle a deck of cards, and place it face down on a table. This is the kind of example beloved of orthodoxy, but nothing in it is intrinsically random. The details of the shuffle were what they were, and led to the order of cards to which they in fact led. Since there is no randomness here, supporters of orthodoxy can't logically get started.