One could take various simulation hypotheses as examples of modernized young universe creationism.

I don't think you can really "refute" that kind of hypotheses. They just stay right where they start, at their priors, not predicting any distinct experiences until a future date.

At most there may be good reasons for the priors to be very low, albeit you won't get very far with the complexity of gods in general - if our universe can plausibly culminate in creation of a super-intelligence, then the complexity of a god is at most not much higher than that of our universe; and for all we know it might well be lower.