Based on what I have seen, the opposite is true.
Schools/teachers often completely ignore the possibility of dyslexia and just label a child as lazy, troublesome and disruptive.
Yes, the child is troublesome and disruptive after being completely baffled by the teacher's instructions.
Dyslexic kids need to be given instructions in a simplified manner - you tell them to read chapter 3 from their book, write a page about what you read then draw a picture, but that happens is the first instruction is washed over by the others and the kid has no idea what to do.
So you break it down:
Go and read chapter 3, then come back to me.
Then you issue the next task.Write a page about what you read, and come back to me
And finally.ok, now draw a picture about something in the story.
I've seen the difference in these approaches - it is stark.
Is it more likely that schools and teachers are waking up to the signs that some kids need more targetted help, resulting in what Ofsted sees as an influx?