I am not dyslexic, but the roboto example also highlighted a very stark difference in readability for me! Especially after having gotten used to shantell sans reading up to that point, the roboto felt nigh-unreadable.
I also love this font -- it seems very readable and could be a good go-to in many places.
Having said that -- the speciifc image showing difference between this font and Roboto -- uses a lower contrast for Roboto -- which surely has an effect on its readability?
I wish they showed a more direct comparison without changing the contrast to introduce an extra element.