Should he really drop in that case? if he is in yellow? he should just try and see how long he can go in that case. He can stop when he drops out of top5 and feels fatigue is to much to still perform on WC. But why would he drop earlier when he is in the lead or on the podium? For the same thing Pog & vingegaard get sick and he is in prime place to win.The first weekend is basically created for him... Win a stage and the yellow jersey there. Then during the first mountain stage, just let yourself drop.
I don't think he can recover from covid, get in a good enough form to content podium at the Tour. And if you can't do that, why even bother trying that and get the whole country on your case again... Just ride the Tour to experience it, have fun, and win some stages. Use it as a training for WC, and win the TT as well as the road race. You can still go on holiday and focus on Canadian and Italian classics afterwards.
I agree with Logic here.