But webmention.io responds with:

{
"status": "no_link_found",
"source": "https://www.jvt.me/posts/2019/08/28/content-kind/",
"target": "https://www.jvt.me/posts/2019/08/18/restructure-content-types/",
"summary": "The source document does not have a link to the target URL"
}