Even hobbyist kites can become quite scary when the wind gets stronger. I don't want to be hit on the head by a kite turbine in strong winds.
Potential for damage and energy are probably correlated, in the sense that this design seems to attempt to harvest low-altitude winds (30m), while makani and others wanted to get the high-altitude stronger and more constant ones.
This design does not have an heavy high flying turbine, it has a small lightweight one, and they plan to have multiple tethering ropes so I think the risk you face is in fact in the same ballpark as a hobbyist kite.
IANA wind-electricity-physics person tho, so take everything I say with a large grain of salt.