Haha, you really can't help yourself can you, I'm a competitive athlete so I know all that needs to be known about VO2Max, unlike you apparently. Genetics are (normally) where it starts and that never changes and then you need to train it, so yeah if you can't train its going to go down, OK so far ? No such problem for Froome, he said it himself. There's a reason Lemond was always asking dodgy champs what their VO2Max was...
You must have missed 2015 when GSK lab released Froome's test data
But, please...carry on...