Yeah, I'm going to say that doesn't count seeing as Uke's already hit the ground, making the actual distance a few meters shorter. The whole "Uke falling" is enough of a grey area as it is anyway.
On the topic, I was actually thinking about changing the record to the distance between the last point of ground contact and where the kick decapitates Uke. It would certainly be possible with the accuracy of the distance script, as well as eliminating loopholes like waiting for Uke to fall. How does that sound?