Just for clarity - we're talking about the main gate that is right on Red Rock road correct? - not the second gate down that track that would just get you a bit closer to Weir's Creek - just to eliminate any confusion. I double checked the official road closure map and it looks like that entire track is closed.
The main gate on Red Rock Road has been open every time I've been down the Vic range in the last 18 months I've been living in Vic and visiting the Grampians. There would have been no need to go around the gate. For international climbers who pick up the guide book and drive down there - they would just drive right on in - not being aware that the road is closed - no signage etc. Expecting people to not drive down tracks when a gate is open and there is no signage to say it's not permitted, only PDFs published on PV web-sites etc. - that's optimistic. Some climbers are extra-conscientious, and will check on access issues prior to going to a crag, but many will just pick up the guide book and go - at many international crags I have been to, closures are clearly marked at the location.
If Matthew's track becomes the proxy track for these sites, it's just going to lead to more tracks running the 300-400m between that track and the Emu Foot Track - i.e. more impact, particularly until these tracks become well defined and climbers just walk uphill randomly. Seems counter-productive?