notice this is a vastly different project though: it's not a high-flying kite with complex steering logic; it's a small wind wheel that transmits torque to the ground. If this things crashes to the ground there is basically no expensive damage.
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.