It's not, this is private land. The footpaths are incorrectly labelled, and the boundary with National Trust labnd has not been correctly marked. Please see title AV78472 on the Land Registry for confirmation. This map also shows the correct boundary: https://www.smallcombegardencemetery.org/_files/ugd/835853_d7bfc08d21be4f03b435551a5ba2efca.pdf