This doesn't contradict at all about what I wrote about what limits Vo2Max, and even in cycling like leg-oriented exercise it isn't mainly muscle mass. And it is likely that a large portion of the weight loss between 80.5 kg (February OFFSeason figure) and 75.2 kg (September INSeason figure) wasn't metabolically active tissue at all or almost all fat. His BMI fell from c:a 25.5 to 24.0 and with his 1993 weight he was quite heavy for a all-round-cyclist / one day specialist.No, we shouldn't expect a close correlation, but obviously there comes a certain point in weight loss when the power loss neutralizes the effect of less weight.
Did you notice that I haven't mentioned "power" (Peak/FTP/Power at Vo2Max?) at all because it is a different concept than Vo2Max which is mainly limited by "central" factors that aren't affected by weight loss. I am not even disputing that all the above categories of power (and performance) can be reduced by weight loss, even very low intensity performance can fall if body must use more energy-inefficient type II muscle fibers after losing muscle mass even if Vo2Max is unchanged.This of course is why riders reach some more or less stable weight. They don't try to go below this, because of the power loss. But they don't necessarily reach this minimum weight without some power loss; it's just that the loss is compensated for by the weight loss. The minimum weight is not the point below which absolute power is lost for the first time. It's the point below which relative power is lost for the first time..