He's not denying that the conditions exist. What he is denying is that they are illnesses. A more accurate term would be injury.
how is that even relevant as long as he doesnt point out what implications that distinction should have, in his opinion?
If you catch a cold, you can hardly blame the guy who gave it to you. (Well, you
can, but there's nothing you can
do about it.) If someone breaks your leg, however....