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Notes -
This is true in theory, and a decent model for small wind turbines in relatively slow winds.
It's not useful for large modern turbines (let's say 3 MW and up), since it assumes that higher wind speed automatically results in faster rotor RPM. But since rotor RPM is critically limited by blade tip velocity, a large turbine reaches max RPM in ultra light wind. After that point, power scales linear with wind speed. See this power curve, first example I found
Add to that, that a large turbine reaches nameplate capacity at around 10 m/s wind speed (and goes linear at around 3 m/s, shuts down at around 30 m/s), and it's really not that much of a problem in a modern park.
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