1. He just reminds not to use standard nut torque.
2. It very much depends on your tire size and compound. Normally you want to be 35 psi hot. He is right to suggest higher since stock camber is very low. Also, that's what you actually need since tires are too narrow for the load.
3. Few long straights on the ring work as a cooling laps, but, yes - if you know the track well, you can carry speed from the corner. If your main experience with the track is watching Ring Crash YouTube channel, then you won't do that good.
4. I plan to try zero regen - in the beginning you anyway have no regen since battery is full. Before you run out of juice you have like 5/20 minutes of regen charge at 75kW - it's just 8% of lost charge at best while it's ~1.5kW of average heat input into the cooling system. Certainly that's not a good idea for stock brakes. And I also don't like that it breaks when I don't want to.
Other than that, great video, now I know where is this unchartered supercharger. It's smart they didn't put it on a map, otherwise people would use it who are not coming to race.