Whilst Omni is quite blunt, his point does have some merit. In the top-tier firms, you'll see that the vast majority of clerks/paralegals are USyd/UNSW. There is a spattering of UTS/Macquarie (Clayton Utz, in particular, has a higher proportion of Macquarie paralegals than other top-tiers), with very limited UWS.
In saying that, it is possible to get into the top tier, if you go to say, UWS. Evidence?
Here. UWS student, being a clerk at Mallesons.
In saying that, she's heading for the medal. So that's where Omni's point has merit - in that, if you're going to say, UWS, and you want a top-tier commercial law career, then you have to be within medal contention. Whereas, at say, USyd or UNSW, you can be around the middle of your cohort and still get access to top-tier clerkships.