[I]t means that there is a part to the application of Bayes, i.e., induction, which requires the acquisition of semantic concepts.

I think this is incorrect. The actual application of Bayes' theorem works the same way for each of your theories. What differs is your priors, and that difference sticks around until you have some evidence that's more likely for one theory than another. If your priors are screwy, then yes, you'll hold wrong beliefs until you're given evidence that lets you distinguish between the correct and incorrect beliefs.