IIRC, the book gives it as a much more direct meaning: the original actuaries were forced by Teddy Roosevelt or someone's programs to quickly come up with policies for things that had never been covered before and so could not be given clear frequentist justifications, so they used Bayesian methods.
Stanford Professor Sam Savage (also of Probability Management) proposes that large firms appoint a "Chief Probability Officer." Here is a description from Douglas Hubbard's How to Measure Anything, ch. 6:
Hubbard adds some of his own ideas to the proposal: