@shellsharks agreed, and from what I can see, a lot of the implementations of webmentions are no longer actively maintained. That also seems to be a wider thing im seeing in IndieWeb. Lots of activity 2017-2021 but has trailed off since then.
From the outside looking in, part of the problem is that a website doesn’t really function well in a “community” microblogging like Mastodon/X/Nostr brings that to the table.