He raises a lot of good points about the methodology that staff used. They can use those wishy-washy and opaque categories like "Healthy Neighbourhoods" and non-justifications like "visually obstructs vista over Humber River" or "Reduced intuitive wayfinding" as arguments against grade separations, while keeping hard metrics like travel-time impacts, operating costs, ridership impact, etc., hidden. By weighing whatever factor they want, they can come to whatever pre-ordained conclusion they want: in this case, a cookie-cutter centre-of-the-road streetcar in ROW configuration.
It's also good that he points out that they looked at grade-separations in isolation, when the Metrolinx BCA for Eglinton West showed the highest cost-benefit for an entirely grade separated line.
The problem is his tunnel-vision: until Toronto has a modern operating elevated line, we will never see what they can do, at a fraction of the cost of a buried line (the screeching, neglected, SRT that runs through industrial dumps isn't a good comparison). A side of the road, elevated configuration (except maybe for Martin Grove because I'm not sure what the best way is to figure out the mess with the highway ramps and power lines) would mitigate all the traffic impacts and give transit users the speed and reliability to ensure the success of this line.