Not with dyslexia, no. Because the problem lies with the syntax and semantics of the language and since programming languages are logic based rather than evolved from grunts with complex non-obvious rules, many people with learning difficulties (including myself) find it massively easier to parse code than English.

To use myself as an example, it took me around 30 seconds just to read and understand the first challenge, yet I was able to solve it in around 10 seconds after that despite it being a Javascript language (which is probably the weakest of the dozen or so languages I code in). If I was to go head to head with someone, that 30 second read time would be a hell of a handicap.

As for poorer eyesight, yes you'd have a point there, but at least the playing field would be levelled out a little more.