CBR Cycle Routes are the Principal Community Routes around Canberra. In OpenStreetMap, some routes have still not been marked. Here is the lost and found list, including maps.
The Belconnen Bikeway has come a long way but was not finished before the 2020 ACT Election, despite having been promised at the election four years before that. Your guide to cycling in Canberra TCCS map (January 2019) shows that the bikeway had been expected to be finished well before the election.
CBR Cycle Routes are motorways for cyclists, or at least that is the intent. You would know them as you would have ridden on one. Finally, they are getting wayfinding signage. It makes a difference.
A bike network is more than the sum of its parts. Small gaps can greatly decrease the popularity of the route. Missing links is a term that describes gaps in the cycling network, and those gaps can be quite short.