Actually, I meant to do that too, but must have forgotten.
I agree, we should only show bindings up to the version we support
perhaps (is that 2.6 or 2.8? I can't remember).
This list is not updated by anyone except us though. The problem is
that it will definitely become out of date unless someone actively
checks up on all bindings. That is probably also why the bindings on
there are mostly out of date for a lot of languages.
Speaking as one of the maintainers for the Ada binding, it is
up-to-date for gtk+ 2.8, and partially for 2.10. Should I
convey this information by some other means to maintainers ?