This whole project has been fumbled so badly in terms of communication and timelines. The current layout has been in place for, what, over 5 years now and we still have no idea what the future is.
My guess is that those drawings should have been published as an ETRO rather than TRO and the two "supplementary measures" are formalising the measures that could be introduced if the new ETRO doesn't work out - restoring the modal filters, and making Comiston Terrace one way. I'd prefer they just scrapped the new segregated lanes, kept the new pavement build out at Midmar, and introduced those Supplementary Measures. It'd strengthen what's there at the moment, and save a fortune building out those segregated lanes.