Thanks for this.
That link talks a lot about difficulty in reading, but my DS has no difficulty. He is currently reading the last of the Dark Materials trilogy, he read all the Harry Potter stuff, Jeremy Strong, etc.
She wants him assessed because his organisation and time management is not good. He often doesn't get his writing down as quickly as he should, he doesn't read instructions properly and does the wrong thing.
TBH I don't think he's dyslexic but she seems keen on it, so if it's going to be done then it might as well be done quickly. If he's not (and I suspect he won't be) then she might concentrate on getting him to improve his organisational skills. (God knows I try! )