Yes, but the amount they gain and then have to lose again is the issue. Plus, the closer you live to your race weight the 'easier' it is for your body to adapt. Yes, its easier for some than others, but a pro needs to make the sacrifice.Every pro cyclist is more heavy in the off season and gradually loses weight towards their goals. That's totally fine. It's when he does it like last year, between Dauphiné and Tour, that it becomes a big risk.
Side note: does something obvious like "Every pro cyclist is more heavy in the off season and gradually loses weight towards their goals." need to be stated? Is there anyone who doesn't know that?