I believe the lad in question has followed an older sibling to Hunters Hill, as often happens with boys from the bush who seek to finish off their high school studies at Sydney schools in year 10 or 11. Quite a number of the NSW Under 15's seemed to have ended up with places at several private schools in town, following their wins against QLD & ACT last year.
Unfortunately, there seems to have been very little reported on NSW or NSWJRU sites about their matches, and only a 2-line reference on the Qld juniors site.
From all reports, a pretty good bunch of kids though, who played some entertaining rugby at times.