The official route of the PF to the old Castle Howard Station has always been as https://map.atownsend.org.uk/maps/map/map.html#18/54.09157/-0.87598/H/P shows it.  Previously, in around 2018 at least, signage was poor and the nearest thing to a path joined to the guidepost https://www.openstreetmap.org/node/6143841068 directly. 
However, the landowner has apparently reinstated the correct path (and added a fence, making it much clearer where the path goes - a much needed improvement).
I've reflected those changes in this changeset here.  There's more to add (any new Centenery Way or public footpath signage, the new fence).
