This was my immediate reaction. It's only disempowering if it leads to exclusion or limitation of options. Here in the U.S., at least in the parts I've inhabited, the opposite is generally true. Great efforts are made, with great success, to address dyslexia.
I actually know some people who are, or were, dyslexic. Identification of dyslexia is, when done right (sorry to have to use that terribly privileged term here, but I cling to the primitive notion that some things can be done right and some wrong) anything but disempowering. When a person with dyslexia is correctly identified and special efforts made to overcome it, that person will often end up able to read and continue with his education at a level that would have been impossible if the condition had not been addressed. Not so very long ago people who were dyslexic were labeled as stupid or slow, and denied many opportunities as a result. In other instances, the special education was once reserved only for the luckiest, and perhaps the richest, among us. When Nelson Rockefeller was growing up dyslexic, the special education he got was pretty rare. Two generations later, it's pretty common.
I don't know where Jonesboy comes from (if there's any there there for him at all), but from my American perspective his original post is not only nonsensical, but trivializes and insults the work done by the many educators who have succeeded in opening doors for dyslexic students which once were closed to them by people who, like Jonesboy, failed to recognize the condition and in so doing failed to provide the necessary teaching to get past it.
Jonesboy, even if you were correct in saying that dyslexia somehow doesn't exist, you would be dead wrong in calling it a "disempowering term of abuse." That's just sheer ignorance.