Using that criteria, every reentry vehicle including the Space Shuttle would be a "sky dive". I searched on the web and couldn't come up with a good definition, but I'm sure one exists.
This guy is using a pressurized suit, so it just doesn't seem like that much of a stretch to single person capsule.
However, the shuttle enters the descent carrying over the momentum from its rockets during the launch. The balloon was roughly at rest, rather than in orbit.
What if he used a balloon with a capsule attached and just released the capsule? By that definition that would be a sky dive, but it still doesn't seem like a sky dive.
This guy is using a pressurized suit, so it just doesn't seem like that much of a stretch to single person capsule.