I'm thinking holding lines were moved back a few years ago to give more clearance for A380 ops? It's still a 45m runway but the clearances to the sides are the same as a 60m one.
Just guessing here mind you. It all happened the same time MEL was widened to 60m and somebody said that they couldn't widen the SYD 16R/34L pavement for some reason but they could increase the clearance to the sides.
That's why the issue of bums infringing taxiway B has only been an issue on recent years.