No he didn't mention Bailey comb changes. But here's a virologist that does.as much as I like and respect Robert Pickard, he is a neurologist not a bacteriologist. Did he tell you to Bailey change your colonies relentlessly in his talk?
I prefer also to treat my bees sensibly not put every barrier possible in the way for them to develop and thrive without constant, unneeded effort
https://www.theapiarist.org/tag/bailey-comb-change/
Fortunately after a couple of years of checking all my colonies in Spring & acting if I found a problem, I need to do it less. Highly recommend if it is found, as it works, speeds up their development and they thrive.