It is a good question, I have read mixed reports about the effectiveness as well. Besides specific typefaces, there are also techniques like bionic reading.

https://www.indwes.edu/adult-graduate/ng-blog/stories/what-i...

https://bionic-reading.com/

Sorry again, I thought I remembered the designer talking about this in the video I referenced. I should have watched it again before referencing it.

Interesting, my dyslexic sister absolutely swears by Dyslexie (a similar font) and has set her Kindle to use it all the time.

I wonder if there are different sub-variants of dyslexia that work on different principles?