Following that logic, any miraculous transformation becomes justifiable.Kruijswijk finished 124th in stage 1 of this year's Tour. Doesn't say anything, it's just a dom taking it easy. Tony Martin finished 81st in the first ITT in last year's Tour.
Within context, Vingegaard was never viewed as a future GT winner in November 2020. The only ones who imagined such a scenario would be Jumbo's staff themselves based on the data they had.
But let's not rewrite history or find excuses, i.e. this is a Froome level type transformation from nothing to legendary climber & ITT specialist. You can always dig into a rider's past & find xyz stage or result which might hint at some star potential, but as a whole, Vingegaard's youth results & performances until early 2021 do not paint the picture of a Tour de France winner less than 2 years later.