AG cannot tell you or any other aircraft in circuit what to do, it can only give you information.
If I feel that another pilot would benefit (ie, I will benefit by not hitting someone I simply cannot see) then I would pass my intentions to traffic.
In theory, all circuit traffic will be listening anyway. The reality of often a different matter.
Reality may be - When the radio is not manned so calls dry up as there is no op to reply. Other traffic still will benefit from "traffic" calls. Another common reality is non radio traffic. This comes back to the lookout. Because you haven't heard him call, does that mean he isn't there... even though you haven't seen him yet?
I've met Paulo and he's a very nice bloke as well as being an accomplished pilot. Its a good question and deserves good answers.