GitHub's contributor graph is based on authorship of Git commits, and doesn't track whether a given GitHub account ever actually interacted with a given GitHub repo. This Git repo is a fork of the htmx Git repo (though it's not marked as such on GitHub), so all contributors to htmx as of the fork date are also contributors here.
Ahhh makes sense if it's a fork. Odd that it's not marked as one. Sort of an odd thing that you can get associated with a repo you don't even know exists.
GitHub's contributor graph is based on authorship of Git commits, and doesn't track whether a given GitHub account ever actually interacted with a given GitHub repo. This Git repo is a fork of the htmx Git repo (though it's not marked as such on GitHub), so all contributors to htmx as of the fork date are also contributors here.