I watched that about a week or so ago. Entertaining video, as you come to expect with anything Seth puts out there. Regardless of the ebike, you gotta give the guy credit for his willingness to try really hard stuff both up and down. I don't think the motor makes committing to those features any easier. I'm sure it would help on the hard uphill punchy moves, but only if you know what you're doing. I think he was benefitted a bit on the sketchy downhill moves by modern geometry. In a few cases, the bike was taking him for a ride, but it worked out. The guy could become an excellent bike handler with very little effort if he decides to stay with it.