Is that even true? The article is really vague on the type of disability and basically just claims that serifs are harder to read.
Generally sans-serif is advisable for small sizes, although I assume the main things are large open counters, tall x-height and low stroke contrast.
I’ve often read that dyslexics favor strongly distinctive characters and “grounded”, bottom-heavy letterforms. I feel like serifs actually sound pretty good there.
It’s also important to consider whether such studies were conducted before or after high-PPI displays became prevalent and leveled the playing field for serifs.
