No doubt someone will find out what he meant. I suspect that he sees Andy playing well and is hinting that an excuse is applicable if he loses. He does that and develops injuries during critical matches!
Just seen the articles posted. I will read them with interest. Such a contrast between players and their reaction to defeats. Andy and Federer rarely make excuses and admit they were beaten. Rafa, Novak (& now Stan ?) claim exhaustion or injury not that they were beaten fair and square?
Interesting point. You can never trust unequivocal statements like this. Could be a smokescreen, a red herring, or a losing scenario narrative, but Andy will not waste time second guessing the motives. A fully fit and engaged Djokovic is what they will expect on the day as I do.