Losing much weight while training to get in peak shape, is not possible without risking performance. As far as my basic knowledge goes, sportsnutritionists will tell you to lose the weight during off-season / off-peak periods. Ironically, that's the time our boy uses to do the exact opposite. Slow weight loss can help performance, fast weight loss impedes it, specifically strength and anaerobic performance. Basically, it's not just getting to your best optimal weight, but how you reach it is even more important. The difference between Vuelta '22 and '23.
Basically there is no way he will be at optimal GC weight AND optimal GC form at the same time, in time for the TDF.