Point taken, but Lewis wasn't operating within a Bayesian framework. I haven't read a lot of his apologetics, but what I remember seemed to be working through the lens of informal philosophy, where a concept is accepted or rejected as a unit based on whether or not you can think of sufficiently clever responses to all the challenges you're aware of.

From this perspective, a "settled intention of continuing to believe" implies putting a lot more mental effort into finding clever defenses of your beliefs, and Lewis's professed acceptance of reason implies nothing more than admitting challenges in principle. Since it's possible to rationalize pretty much anything, this strikes me as functionally equivalent to refusing to update.

And, of course, enshrining the state of holding high priors as virtuous in itself carries its own problems.