Half of those hits are in the social sciences. I suspect that is economists defining the rational agents they study as bayesian, but that is rather different from the economists being bayesian themselves! The other half are in math & staticstics is probably that bayesian statisticians are becoming more common, which you might count as science (and 10% are in science proper).

Anyhow, it's clear from the context (I'd have thought from the quote) that he just means that the vast majority of scientists are not interested in defining science precisely.