This is quickly becoming the norm for experts, unfortunately. I keep seeing more an more people with educational expertise in something that they have zero hands-on or practical experience with.
I remember being at a social event once and chatting with someone who was a business professor at any Ivy League university. Making small talk, I asked him which companies he'd worked at, and he told me that he had gone the academic track and started teaching during and after getting his PhD (in exactly what I don't remember). I remember being stunned that students would pay over $60k a year to learn about business from someone who'd never worked for or started a business.