There’s no question that a stick will wobble in the wind, the real challenge is getting significant power out of an alternator that’s moving at less than 15Hz. Fo they address how they plan to make that work anywhere on the website?
"We estimated the LCOE as very good"
Come back when you've demonstrated it.
Next, eliminate motion.
A conductive grid stretched between buildings or bridge uprights, or even between wind turbine towers (with or without operating turbines), with a streamer at each intersection made of slightly conductive material that sheds electrons to passing wind, builds up a voltage relative to ground that can do work.
A lightweight grid carried aloft on a kite would extract power proportional to the 4th power of altitude, with the restoring electron current running up the (conductive) kitestring.
Such a system was patented in the '80s by Alvin Marks, holder of the patent on polarizing sunglasses, shortly before he died.
There is no upper limit on the practical size of such a grid, and construction is extremely cheap. Attached to existing structures, it would be designed to extract only a small fraction of available power so as not to exceed the design limit of the structures.
On kites, the sky is the limit. A stacked series of grids could extract up to the theoretical maximum of 30% of incident power. A good place to fly such a kite is in an existing nuclear power plant overflight exclusion zone, where they might extract more power than had been (or is still being) generated below. This also provides convenient access to an existing regional power distribution grid.