I share these concerns. ADL really goes off the rails sometimes. (Ilhan Omar is my rep, so that example hits close to home!)
It's really worth looking at the actual study. As @raf said, they're clear about what they asked, and why. They're not quite asking the questions you posit. And despite using ADL resources in formulating some of the questions they did ask, their methodology answers a whole lot of the concerns you & I share.
Excerpts in screenshots: