Sounds like the DHC-8 was lining up at the other end at Rwy 11. Had it been entering Rwy 29, the report would be talking about a near collision or near miss and the first officer should have seen the 172 looming large in his side window.
When I am on short finals I am focussed on the threshold steady in the windscreen and my airspeed. The other end of the runway, 1341m away, would be in my peripheral vision and would not be noticed in detail until focussing on it in the flare and hold-off, if then.
Also remember there is the infamous hump in the middle of the runway at Toowoomba, making aircraft potentially lining up to face each other invisible from each end.
To state the obvious, someone has probably been on the wrong frequency, or had the volume turned down.