Thank you so much for taking the time to research and share you findings.

As to Atkinson Hyperlegible, I suppose its merit could be, at most, making it harder to confuse characters. This blog post shows how Atkinson Hyperlegible makes it easy to distinguish:

• Capital I, lowercase l, pipe |, numeral 1: I l | 1
• Capital O, zero: O 0
• Capital B, numeral 8: B 8

Beyond these benefits (and as you mentioned), there is just not enough information on whether Atkinson Hyperlegible definitely helps or not.

Also, thanks for the link on dyslexia. I suppose that, to an extent, promoting fonts like Open Dyslexia could lead to the unintended consequences described in the article.