1. I think it is very doubtful to say, a dead person is dyslexic, no one could have assessed that. Of course you can not say, he would be not, either. Nevertheless you could then claim that Heisenberg, Gauss, Hilbert, etc. were dyslexic, too. => Who knows? But just not being able to exclude a diagnose -especially after no kind of assesment at all - doesn't make it true.
2. He had excellent grades throughout his school career, read very difficult books at a very early age, etc. ... His English wasn't flawless, right, but this can be also explained by being German and German being his mothertongue. Pencil grip... ???
3. You can also read Einstein was suffering from dyscalculia. Another claim I can't really understand and makes me even more doubtful over the claims that Einstein was dyslexic. Especially as both are mainly detected because people show deficits at a level of their educational career, Einstein showed none of them, despite concerning fields (really advanced math, foreign languages, he had never properly learned, ...) everybody struggles somewhy. What can be certain, that he has never been in need of special accomodations at school or university to reach his full potential and play on the same level.
I don't think you can't discuss or ask if Einstein had not some traits, that would count today as disability, but claiming just like that, that he was dyslexic... No, ... (Although I am allways open to articles prooving new insights and/or papers. Just not the shear enumerations of people counting as dyslexic including Einstein.)
Anyway your answer is worth to be discussed and accepted, Froggponde's not.