Here's an article that has more details and a video. https://www.globalcitizen.org/en/content/homemade-wind-power...
You still need to rectify the voltage to store the energy in lead acid batteries, losing precious voltage in the diodes. I wonder how they get the >13V to charge the batteries.
Power output is probably <10W average.
Are the motors AC or DC? Even if DC, you’ll need diodes to avoid turning the generator into a motor.
Since they were only talking about a few hours of light at an “equivalent” of 45 watts, sounds like a 5 watt LED.
If they keep it really simple, they just charge at a really low rate as long as there’s some wind and throw away the rest of the power.