In defence of the Brumbies there isn't much point investing in fan communication when you don't have any fans. Maybe when more than 10 people show up to a home game they'll get around to updating it.
In defence of the tahs (ugh, that feels gross) they have actually updated their squad on the website, the design is just terrible - when you go to
the squad page you have to scroll halfway down the page - past the news section, super rugby table and a link to sign up as a member, before you see the actual players.