I mean, you just had to look at the pictures of him after winning Donostia before the Vuelta. He looked a lot thinner than during spring, actually gc rider thin.I remember being ridiculed last year by another forum member because it was my opinion that he (Evenepoel, not the other forum member) needed to lose more weight, and that 63 which was said to be his target Vuelta weight was still too much. After the Vuelta it was revealed he actually lost considerably more weight than that and he lost 3 extra kg compared to his Liège weight, which was (according to him and the team) around 64kg. He also looked considerably skinnier during the Vuelta than Liège.
Anyway, i think he is now already skinnier than he was last year during Liège. So i have a hard time believing he is going to drop another 4kg. Two seems realistic, though Evenepoel himself is talking about "that last kilo".
Yeah, I think I remember that we've talked before about how the team has always talked lot of bs about his weight/target weight and retconned things multiple times afterwards (see 2021 Giro).