Gentle and thoughtful Cath is on the warpath - and justifiably so.
Some loon (Graham Stringer, MP for Blackley) is trying to deny the existence of dyslexia, a well-evidenced and widespread disorder, using false claims, fallacious reasoning, and other tactics familiar to rational people.
I cannot add anything to her very lucid demolition of his article. I'll just give a couple of potentially useful links for further reading.
Here's an international list of Dyslexia research and support organizations that a quick search brought up, in case anyone wants to read further: Dyslexia Parents Resource.
And if you're from the Blackley area, check out Stringer's contact info, voting record, etc. on this page.