Bit of a dredge on this...
I'd be happy to see a 10 min video on just the internal gearing
It's surprising he's not a bit more upfront about the fact it's based around a Shimano Alfine hub thats been tucked into the frame - that's why it was easy to go from 8 to 11 speed.
Would still be interesting to see what he had to do to get the whole system working through the swinging arm, but there are moments in the video that would suggest he had created this magical 'epicyclic gearbox' with up/down backwards/stationary shifting, when that's clearly not the case.
Still love a Millyard video. All the stuff he does is mind blowing and the videos are lovely things on their own.