The referenced report from Nielsen-Norman is from 2006 and outdated. They published corrections at https://www.nngroup.com/articles/f-shaped-pattern-reading-we...
> The study also found some alternative scanning patterns such as layer-cake pattern, spotted pattern, marking pattern, bypassing pattern, and commitment pattern.
> It’s important to note that F-pattern is [negative for users](https://www.nngroup.com/articles/f-shaped-pattern-reading-we...), but good content design can help prevent F-shape scanning.