I've compared this map to the MTBO version, which you can see most of on TBT (for some reason part of the TBT map is the MTBO version and part is the foot version).
The track junction north of #6 on the MTBO version is correct and at least one of the junctions north of #14 is shown. The track NE of #4 is on the MTBO version so it must have disappeared sometime in the past three years. I've downgraded it to 'difficult' (as in difficult to find :P). The track NE of #19 is also shown but I didn't find it yesterday. The track along the fence NW of #17 is also on there.
Your route from 2-3 was probably better than mine (I went up the hill then back down). I had thought the southern route was further but it turns out it was actually the same length as the eastern route so sucks to be me (and Tash and Graeme Harris, who all went that way). There is also a track along the powerlines on the route I took that is not on the foot map.
Mind you, this version of the map hasn't been used in goodness knows how long - I've never run on it so probably not in my time - so no surprise it doesn't get updated.
The track out of 4 is probably there I just found a way to get off it without trying, just look at my navigation skills to control 12 couldn't even get that right. 2-3 going up that hill would have killed my legs way to early and so much less climb. I thought the setting overall was good, quite a few different options on several legs but 11 - 13 was just some cruel joke.
Sten, both of those events are before my time (just, I started bush orienteering at the Autumn Classic in 2008) and I think nine years qualifies as goodness knows how long!
Eliot, you, me, Sten and Cameron all lost the track out of 4 so I would imagine there's a good chance it's not there anymore (Sten and I took an almost identical cross-country route).