In the "Performing RevisionBased update" procedure, bullet #3 doesn't show the actual command that needs to be used:

3. Move the workloads to the new control plane by updating the istio.io/rev label on the application namespace or the pods to the revision name of the new control plane.

Command should be something like the following:

oc label namespace <namespace-name> istio.io/rev=<new revision name>