I'm disappointed that their test didn't include a comparison to traditional drip coffee made using the same beans, then chilled to match the temperature of the cold brew.

I haven't looked into ultrasonic cavitation in years, but since it can produce enough heat and light to make some people wonder if it was a form of nuclear fusion back in the early 2000s, I feel like maybe it's affecting the flavour of the coffee at least as much as using hot water would.