That's quite understandable. Unlike most other nodes in OSM, place=* nodes don't represent a physical object and can appear in odd places which are hopefully a good approximation to the centre of the area they represent. I've undeleted it in https://www.openstreetmap.org/changeset/165933187 - as you have local knowledge which I do not, please feel free to move it if you feel that another position better represents the centre of the St Dunstan's are.

Good luck creating the walking tour! A couple of my friends volunteer at Tower Hamlets Cemetery Park and would probably be interested.