I think Supabase generally does good work, but I don't think they can be given credit for pgvector, if that's what you're indicating (I might have misread).

As I understand, Andrew Kane is the principal author of pgvector, and has worked on it for almost two years before Supabase added support for it.

See also https://github.com/pgvector/pgvector/issues/54 and https://github.com/supabase/postgres/pull/472.