The difference between probable and probable

The Rabbi in his book God Plays Dice states that the chance that the universe was created by chance is minimal, but the fact that it is minimal does not mean that it does not exist, and therefore the Rabbi distinguishes between probable and probable. Since the claim is not probable that the universe was created by chance and not that the chance of this is slim, the Rabbi strengthens the physico-theological claim, but I did not understand the Rabbi's conclusion as to why a random creation is not probable and is apparently only not probabilistic [and not probabilistic, not so much an argument, since it is always possible to argue that this did happen, as the Rabbi wrote], since apparently if there is a chance, even a slim one, that the universe was created by chance, this makes this creation probabilistically possible and fulfills the logically possible a priori requirement.
I would like to take this opportunity to thank you for the book and wish you a happy new year.