Personally I prefer new diver, or learning diver, rather than underwater tourist.
Personally, I prefer "English language knowledge impartation specialist", but everyone still just calls me a teacher. Sometimes you just have to call a spade a spade.
Besides, he is not calling new divers or learning divers tourists. He is calling people who refuse to better their skills and depend shamelessly on DMs tourists. Using that criteria, if you are learning, then it does not apply. Read his post again.