Pretty sure you can row for the boat club just you can't partake in events like the boat race if you are not studying or have studied there
I am pretty sure that SUBC allows non-Syd Uni students to row, however need to keep the majority of enrolled students.
The M A/B four race was interesting on many levels. The SUBC of handpicked GPS boys won the B - category, the A's were not judged. Second in the Bs was a St Aug combo of Yr11 rowers, which caught a crab after the start, came to stand still and recovered well. Interestingly the place getters after those two were all former GPS folks now rowing at Sydney. Some came back from HSC, but there was a crew of Yr 2014 boys, former Shore an Joeys which finished 3rd.
I guess boys have various priorities and not too much can be read into this result.