Not the poster you replied to but I remember her earlier comment, I think it was that she's observed that not all the children who have been allocated extra time actually use it, is all.
Just wanted to say on your other comment about reading in Maths, it's tricky because children with low reading ages actually struggle the most in Maths and Science as a result. They actually tend to have more complex vocabulary in the questions.
I'm a teacher and gave feedback to an exam board in person a few years ago as I was working in a school with above average proportion of students with SEND, PP etc and said some of the language in questions relies on existing cultural capital. For example, students didn't know that "you have lost an article" didn't refer to a newspaper article, but to an item.
I say tricky as there's been changes to the exams in my subject to improve accessibility of questions but you can't eradicate disadvantage that way. For example, students with SEND, EAL etc still have to sit speaking exams; students that have been abroad or had families that read to them, took them to museums or abroad will find many subjects easier because of existing knowledge outside of school. That last point isn't relevant to SEND but just to the idea of trying to level the playing field and there being a limit.