Like most climbers I respect ‘bird closures’, where they are known and understood (eg some routes at Arapalies mention when you can / cannot climb them due to nesting).
Actually we only noticed a small sign as we walked around to swim off. Before climbing we chatted to some calm workers who were improving the track and they took some photos of us while climbing – they didn’t mention anything. Nor did anyone else I have asked about Sugarloaf. To be honest the route is not very significant. If you removed this post, I won’t write it up anywhere else. We didn’t see any birds.
If anyone else climbs there they shouldn’t write it up either (althought it should be called ‘the black pearl’ if they did)