Mouldy,
I agree that what Ofsted intends to inspect are what you have listed.
However, given the exceptionally strong correlation between %PP and Ofsted rating, it is definitely worth thinking about how the different factors are linked, and why sorting the list of schools in England as I describe comes up with the results it does.
For example, Ofsted looks at progress. If a child has a safe and warm home, decent clothes, is adequately fed, has parents who are literate and in professional employment and value education, then they are more likely to make good progress. To a first approximation, schools with very low %PP have more such children. Schools with the very highest %PP will have fewer such children. Thus schools with very low %PP will tend to find it somewhat easier to make good progress (and thus be Ofsted Outstanding) than those with very high %PP.
That is not to say that an specific individual PP child is badly fed, poorly housed, has unsupportive parents., or that children without PP may not also have difficulties. Just that there is, statistically, a link between deprivation (of which PP is a crude and imperfect measure) and the 'marks of a successful / unsuccessful school' that Ofsted looks at.
It is a disturbingly accurate predictor for my local secondary schools, btw. There is a %PP below which all the schools are Outstanding, then another threshold below which all are Good, and above which all are RI / Inadequate.