Most likely it's an electric skateboard. But just let's entertain the though for a moment.

How much thrust can 1-2 Horsepower leafblower generate? What is the dispersion of it's stream? Most likely it's made to cover a wide area, so the speed and thrust is low. What if you the nozzle in focus point of parabolic reflector, which could act as stream focuser and jet thrust reverser?

How powerfull the leaf blower would need to be to move 80 kg man on a skateboard?

Anyone here with airflow modeling software?