It’s mentioned in passing in the “Technical Explanation” (but yes, not a full independently-linkable post):
Humans are very fond of making their predictions afterward, so the social process of science requires an advance prediction before we say that a result confirms a theory. But how humans may move in harmony with the way of Bayes, and so wield the power, is a separate issue from whether the math works. When we’re doing the math, we just take for granted that likelihood density functions are fixed properties of a hypothesis and the probability mass sums to 1 and you’d never dream of doing it any other way.
It’s mentioned in passing in the “Technical Explanation” (but yes, not a full independently-linkable post):