[no subject]

    Note that any particular role will have the sum of privileges
    granted directly to it, privileges granted to any role it is
    presently a member of, and privileges granted to PUBLIC.

If PUBLIC still has privileges on the objects then the role still
has privileges, even if you've attempted to revoke them.  You'll
probably need to alter the privileges that PUBLIC has, which might
also require altering other roles' privileges to compensate.

-- 
Michael Fuhr