Yes, the linked school policy was dropped a few years ago. Orleans Park now admits on distance and so do the other non-faith secondaries. You can find admissions policies for each school on their websites.
Catchments have shrunk because there was a big increase in the number of applicants after some of the local primaries expanded and new primaries openened a few years ago. The catchments shrunk even further for secondaries with the best Ofsted ratings because people are more inclined to move house to live closer. But Ofsted ratings change with time too.
What year will you be applying? People have posted council forecasts here in the past, based on primary school numbers. I think the numbers are peaking around now, then I think they start to go down. Brexit (and now maybe Covid) has reduced primary school numbers. Its much easier to get a good primary place now compared to a few years ago. Reduced numbers in Reception will feed into secondaries 7 years later.