Hi, thanks you for taking the time to review my contribution, indeed I was skeptical my self about this tag, I'm all for it when it come to converge to a coherent tagging scheme.
I didn't find this tag because it wasn't mentioned in the wiki page https://wiki.openstreetmap.org/wiki/Tag:historic%3Dtomb or https://wiki.openstreetmap.org/wiki/Tag:cemetery%3Dgrave

one more thing, I'm curious how did you find my changeset, is it some kind of "new/suspicious tags" tracker ?