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.