I think main dealers not wanting used EV is mainly down to the 22% mandate that new car dealers must hit in order for the manufacturer not get hit by penalty. As mentioned around 9:20 video.
I do see what Harry is saying about manufacturers not telling about battery degradation, at around 13:15 of video. Nissan, for example, their service contains a battery report that doesn't tell you anything what so ever. One has to buy Leafspy or other OBD tools to find out.
It's one of the reason I decided to buy new (my only brand new car) for the long range car I want to keep for long term. Through TeslaMate logging, I know the whole history of its battery down to every detail.
You can see I try to keep it between 30%-75%, right around 50% mark.
I don't agree regarding cold weather performance though. In situation where range is actually needed: during long distance driving, heat scavenging from the battery after rapid charging solves the problem pretty well. Day to day, using a bit more energy to warm up the car is non-issue.
The 3 points conclusion is pretty spot on:
1. Target on efficiency. "Efficiency should be name of the game"
2. Battery health openly available for second hand vehicle
3. BEV isn't going to solve climate change, "even if charged on green electricity"
For last point, I think he's forgetting or not aware of V2G or V2H that allows the battery to be an asset. The reality is that we are waaaaaay short on battery production and adoption to allow 100% renewable powered. EV's are battery on wheels, we should start use them when parked.
No single thing is going to solve climate change, but batteries are an important part of the renewable energy solution, and BEV happen to contain the biggest one most people will ever own.