It’s totally possible that wheel flex is the problem. I didn’t read that whole article but I know I had a Zipp wheel that rubbed my frame constantly while every other wheel on that bike didn’t. Why or how… I don’t know. Could have been the spokes. Could have been the rim. Could have been the Willie Nelson. Could have been the wine. I just know it did and others didn’t.
Edit: I read a bit more of that article. It doesnt say wheel rub is unlikely… It explains that we may not properly diagnose the issue and that the “stiffness” is not the only cause.