Except that we know from history that people invent superstitions and act upon those superstitions. Look at all the effort that was wasted telling people to turn off cell phones in flights. Once electronic devices became ubiquitous and there was push-back from passengers, they finally had to admit that if the electronic interference of a handheld device was enough to interfere with onboard instrumentation, natural atmospheric electricity would have rendered flight impossible. The security theater at airports is still ongoing and equally superstitious.

In the case of the OP, the author is pointing out that there is no authoritative test that actual medical doctors can do, so the doctor is not adding any authority to the check. The business is incorrectly ascribing authority to a doctor to form the basis for a prohibition. There is enough information there to pass judgment.