Extremely pedantically, sure. But under that level of pedantry, the whole metric falls apart anyway because there's surely never or rarely been a point in recorded human history where someone hasn't jumped/fallen/not been physically touching the ground themselves (let alone this having been measurable). What about "touching"; your feet are just repelling the ground via electromagnetism.

It's really obvious what the metric is, and trying to pedant-proof it isn't worth bloating it into a mouthful. We can just recognize what it obviously means, say "oh, neat", and move on with our day.

I guess you could count the atmosphere as part of earth, then things over 100km are in little enough of the atmosphere that it's not really 'touching' it the same way. (For example not generating significant lift)