Don't know what the exact specifics are relating to eligibility, but I would imagine you'd have to live in the area as a minimum. Not sure that there would be a 12 month rule as these days plenty of parents move around with their jobs at short notice. So, for me, the 12 month rule only deprives eligible talent, which is not good for the game or the kid.
The original post does sound like someone is trolling about Darryl McDowell White's youngest son.
For me, he is an outstanding talent and BQ/BA should get him back in the fold. His non inclusion at last year's U18's National Championships hurt BA and certainly hurt the Aus U17 team at the recent world's.
There's personality clashes all the time between coaches and players and coaches have firm opinions on players, some right, some wrong. Unfortunately too much emphasis is placed on winning at all costs by the respective State Associations and their coaches, to appease their own egos. Vic Metro would have to be one of the worst in this regard. They need to be congratulated for the fantastic job they do, but the real purpose of the AUS Championships should be about unearthing talent (so get Darryl's son back in the system) and playing kids in their right positions. Positions they will play as seniors. That's not always easy as you really don't know how tall a kid will grow. So err on the safe side and have all players learn guard, post & shooting skills.
There's been plenty of big kids playing the 5 spot that by the time they get to U18 or U20 level & beyond are only a 3 or a 2, yet they don't have the skills or abilities to play as a 3/2 as they've always played the 5. Similarly there's 2's & 3's that by U18/U20 and Seniors are really PG material. But haven't played as a PG as there's always been someone shorter that gets that spot.