I suppose they were mindful of the terrible consequences that an encounter with wake vortices would bring.
Interesting, amazing, daring, even skilled, and I think unnecessarily reckless.
Potentially dangerous (like driving a car), yes, but reckless, no.
The 380 has a huge wing and can fly slow, especially without cargo and most fuel, and careful planning ensured the jetpack pilots stayed out its zone of influence.
Many skeptical professional minds had to be sure of success before the flight was permitted.