Well the edit which marked it as closed due to conservation (https://www.openstreetmap.org/changeset/135305975) is by AWMapper, who has been updating footpaths from the National Trust GIS database over the last few weeks, and says they’re a NT staff member on their profile (https://www.openstreetmap.org/user/AWMapper).

I’ve commented on the original changeset 135290950 to ask about signage for the path closure.