Not sure about the rut theory?? Front wheel will tend to track around the rut, so long as you don't get the front wheel too light and climb out of it!
But I agree you need to let the front end have its way. This looks more like a front knobby walking around on a hard, oiled, dirt track surface. Basically bouncing from knob to knob.
There is a LOT of different things happening before and around 20s. (The whole system, Bike & Rider, is a Quivering Mass, not derogatory, just an observation)
I would expect that the mechanics/technicians know enough about suspension to have the springs and damping pretty close.
Looks to me that the front tyre is oscillating on very edge of grip and side slip, producing weight transfer effects in the tyre itself, that the forks cant really monitor or keep up with.
Here's Mr. H looking for similar, in the days before HD SloMo Video.
Cheers, Daryl.
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