Yes interesting to hear from a coach about how "fueling" has changed. And I don't think it can be discounted as some of the explanation, the problem I see though is that it does not account for the sudden jump in performance. Especially as it is around long enough to have already affected young riders significantly, who, as Julich claimed and I guess he'll know, are also going faster than ever before. But if it's a known known for a longer time than a few years, why did we see an explosion in such a short time? Also the gains that this needs to account for are bonkers, even if you factor in that maybe the training principles of old were wrong from the new perspective.
He also talked about new methods of regeneration, like ice bath etc., but this stuff has been around forever now and we didn't see Froome go up a hill remotely as close as Pogacar does and they at least lay claim to have been the first team to take this stuff really seriously.
So while Julich's take was very interesting to hear about, the main questions remain unsolved for me.