The cycling infrastructure on Osney Mead, put in only this year (2021), is seriously dysfunctional.
Note that there is a cycle track only on one side of Osney Mead. I had the vague idea it was intended to be bi-directional, but it's certainly not marked as such (all the cycle symbols face the same way) and it's way too narrow to be an adequate bi-directional track. So anyone cycling west is probably going to be on the carriageway. So this route is still only usable by people comfortable cycling with the motor traffic on the carriageway. (Update: I'm told the plan is to put a similar cycle track on the south side of Osney Mead, as part of the redevelopment there.)
If it's impossible for the county to build functional cycling infrastructure, the only alternative is clearly to get rid of as much motor traffic as possible. The Workplace Parking Levy that's part of Connecting Oxford needs to cover Osney Mead. And any development of the site should be contingent on a massive reduction in parking provision. The goal should be to get traffic volumes (and speeds) low enough for even the slow and unconfident to be able to cycle with the traffic.