The difference is that Waymo works and FSD does not work, so it's going to be a short video. FSD cannot take a trip without a man behind the wheel, full stop. It is not any more "self driving" than any other car.
But the person can just sit there and not continue to drive after an intervention. I don’t see why this video wouldn’t be possible or interesting.
My Honda Civic also proceeds in a more or less forward direction between driver interventions, but it is not self-driving.
recent civics do actually have decent driver assist beyond just having mostly aligned wheels ;)
You can easily find videos of waymo cars doing crazy stuff that stretches the definition of "working" pretty far. E.g.,