The airport X-Ray scanners degrade the quality of film
This is BS.

so I decided to change to digital and was quite surprised. Quality was better than the one I had with negatives in medium format
and this is also BS (unless he was exclusively shooting Delta 3200 in 645 format or something).

I could care less that it was Salgado who said it, honestly. I'm also quite certain digital will cost him long term in more ways than one.