I'm not sure if i havn't explained myself correctly or if you are misinterpreting what i am saying. Or if i am just missing something.
As far as i have seen, research wise, there is a notable lower incidence of dyslexia in Spain. The language is more correct phonetically comparitive to English, and the words are pronounced similarly to how they are written.
I think there are some differences in Italian in pronounciation, although seemingly phonetically correct in writing. I have not really looked into Italian much but i do speak a little Spanish so am a bit more clued up as to how the language is constructed.
I'm not sure if diagnostics (and if there is a lack there of) play a part.
I also understand that countries that use symbols instead of characters (e.g China, Japan) rely on less syllables, one per character (or symbol), making it easier to find a direct match visually, and thus easier for the dyslexic to visually memorise.
I have come across several articles like the one you posted and find them very interesting and useful in my own personal research.
If i am missing something here please discuss