It is easy to tell that twiggles has made no progress. After 6 or so weeks she comes back without anything new to add to the debate and obviously has no clue as to how schools track pupils.
I don't normally nit pick but I will this time.
some primary schools and nurseries are pretending children start off at the low end, so they can pretend to inspectors of private and state schools that the child has developed only because of their teaching
Name some-failing that a percentage-'some' could be 3 schools, 300 schools or 3000 schools or more.
What does twiggles think inspectors do? 
Does she not realise that they go through all the paper work and look at exercise books of the above average, average, below average and SEN?
Does she think that parents are thick? That intelligent parents in the state sector don't know what their DC can do and are not getting updates and seeing the changes for themselves. Does she think that parents in the private sector are forking out thousands of pounds in fees without keeping a close watch on whether it is worth it?
some schools in rich areas take it out on the child. They won't bother giving the child attention, because the child's advanced, so they let the child coast downwards. But they give reports in writing about the child that pretend the child has started off at a low point in development and then got much better because of the teaching at the school....when the fact is the child was able to read or write when the child started at the school and as the school is giving the child little attention, the child has coasted downwards
This is only a repeat of the first paragraph and the next bit is the same again. She seems to have a very dim view of parents. If they have an advanced child it is probably because they are reasonably intelligent themselves-they know where the child is when they start and school is a partnership. I have never tried to ignore a bright child when teaching but I would imagine it is impossible. OP seems to think that DCs are just apathetic and sit there like a bowl of porridge doing nothing unless the teacher notices them. It supposes that parents never talk to their child and never go in to say the child is bored and it supposes that the inspectors are not free to talk to any child. Above all it ignores the fact that parents can fill in a questionnaire before the inspection and be as candid as they like. They can write whole essays if they wish!
If a bright child is coasting I can't see how it is downwards-how do you unlearn what you can already do?
they want all children to be the same standard
Why? It is much easier to have different standards. Even if you start a lesson from the same place they will all be at different places by the end.
be the same standard, like a photocopier
As a supply teacher I have used many different photocopiers and they are not the same standard! Some are basic and some very advanced with everything in between.
This is happending all over the show
A repeat of the first paragraph-same question. Evidence please.
I can't understand why inspectors are allowing them to get away with it
Again a repeat-from someone who has no idea how a school inspection works.
The ending says the same again-I can't even be bothered to copy and paste.
Basically it could be a very short OP. Twiggles thinks that teachers are lazy and they can teach at the same level for a whole class by pretending that the bright are average so that they coast along and at the end of the year the teacher looks brilliant by getting them back to the place that they were at when they started and that inspectors and parents are so thick or gullible that they can't work this out!! It also doesn't explain what they do with the SEN or below average who are also supposed to make progress.
I suggest that she rewrites if she wishes to continue the debate -with evidence.
I would imagine that she either has an axe to grind with a particular school or she is a home educator who has a very poor opinion of schools in general.