I believe they're referring to an alternative font, Atkinson hyperlegible. The person in the image is using (I believe) Open Dyslexic, and I think the person you're replying to is suggesting Atkinson hyperlegible as an alternative for anyone who has tried Open Dyslexic
I edited my comment, sorry I was at work, but indeed I was talking about Atkinson Hyperglide Font! I used a lot Open Dyslexic before personally, and switching to Atkinson Hyperlegible felt as good to read then Open Dyslexic, while also looking a bit less weird to some colleagues, and being quite Beautiful, I'm very happy with it, getting the best of both worlds!