The video is confounding geometry and wheel testing... yet they found no difference. There you go.
If you're tall and the front end handles right... why mess with 650b?
It's short people who should care. How much should you compromise on your stack height to get that 29" wheel up there. How much buttcrack cleaning is acceptable before you should run a 650b. Maybe running riser bars upsidedown is a solution? I don't know, i'm tall.
Ultimately, i think this is a question riders will ultimately have to answer for themselves. The fact that production frames are being designed around mixed wheel sizes is going to force us to confuse marketing, trails, and rider size, and that's a bummer. But it's also cool that we're reaching that sort of sophistication.
There's never been a better time to be a tall cyclist.