Quite so, the point I was making in my post is that at this remove from the tournament itself it's not possible to know, and that based on experience so far the health hazard although possibly present in Melbourne, by then may not be 'significant'. Novak may have been raising his concerns, as you suggest, in case the hazard to tournament play turns out to be significant. As I mentioned earlier, organisers here have been proactive in reorganising schedules to mitigate hazards. He may also have hoped for an early decision from the AO organisers, such as closing court rooves, that may have been to his advantage.