I work in biomed. Every textbook on epidemiology or medical statistics that I've picked up has had a section on Bayes, so I'm not inclined to believe this.
Here is research about doctors interpreting test results. It seems to favor GP's view that many doctors struggle to weigh test specificity and sensitivity vs disease base rate.
robrenaud|1 month ago
https://bmjopen.bmj.com/content/bmjopen/5/7/e008155.full.pdf