Mrs, although I agree first hand that having dyslexia cannot be whitewashed as a wholly positive advantage, yours is rather a cynical view of the book. The content of the book is sound and has been useful to many, giving a parent much insight into how their child's mind works. Have a look at the reviews - many have found it very helpful indeed.
Obviously, each child with or without dyslexia
is an individual and has a varying profile of strengths and weaknesses. However, I'd not 'debunk' the book without seeing what it has to offer to a parent first.
I'd rather stay out of debates and offer suggestions of what other parents have found to be helpful and insightful. Have a read of the book reviews first and borrow from a library so that you've not committed yourself financially to the hope that 'these might hit the spot'.
Dyslexia comes with significant challenges. Of course it does! There are often co-morbidities, too (ADHD, dyspraxia, dysgraphia, autism, hypermobility, etc.). However, so much can be done to overcome the most difficult aspects of each with the right understanding, a positive attitude and good direction in how to support an individual's challenges.