Surely the purported benefits of keytones (sparing glycogen) are more important in stage racing than one day races? Keytones became a popular subject during the reign of Sky.I can't help liking him. And I like the way he goes about his races, but .... that was hard to come to any conclusion much different from Pidcocks's "What the Fxxk.?"
As an endurance coach (different sport) I'm learning as much as I can at the moment about Ketones and MCTs as I can. They probably do make a difference, but you'd expect pretty much the whole peloton to be across that by now, so, unless Vingo and Pog are particularly adept at using them... there must be something else. Maybe their metabolical flexibility (everyone's is different) is off the scale.
I do think something is going on at the big teams since 2021 but keytones do not explain what Pog has demonstrated in classics (or Vingo at the TdF). I think keytones are a convenient distraction - look over there !