This is just not true. But Vingegaard doesn't come up with excuses for a poor performance in the Tour... he doesn't have to because he won
I know there's this myth among Pogacar fanboys that Vingegaard can only beat him if Pogi is somehow injured or lacking in preparation, but this is nonsense. Pogi knows this, that's why he seems to have switched around his preparation this year. Unfortunately for him he probably won't get to show if it actually makes a difference against Vingegaard in the Tour, since Vingegaard won't be there.