They are doing a lot more than than just using macros.
They are currently doing something to prevent their win-streak from decreasing (see e.g.
this stream with Mike Ross), which they also did during the last beta. Furthermore, during the last beta, they engaged in several matches with Infiltration, somehow managed to repeatedly match up against infiltration, and then started playing under Infiltration's username shortly thereafter (see
here). So they are clearly doing stuff to manipulate the servers, probably enabled by poor security practices on the client side.