I recoiled at that a bit too, but I think what they mean is similar to how some games can "only be played once". Best example of that is Outer Wilds, where attaining information is the goal of each gameplay loop. Once you've acquired that knowledge already, the fun of acquiring it can no longer be experienced since you already know what the "next step" is.

Quite often, the meaning of a text relies on the contexts you bring to it. I’ve had many experiences where I’ve returned to a text after reading others, and gleaned entirely new or different insights from it. I disagree with the idea that first exposure exhausts the knowledge (or in OP’s perspective, “Bayesian system”) that can be acquired.