Watching the helmet camera, past videos of the rider, and seeing how the course rode, here is what I think happened.
The table is between 2 serious questions of related distances. It is against a tree line where there may have been shadows that disrupt the visual representation of the fence (classic jumping into and out of shadows).
As has been hammered into me from a long time ago, there are no such things as “let up” or “easy” fences on course. And any fence that is “easy” is one that you need to ride insanely accurately, not for anything more other than to add money into the confidence and trust bank of your horse. Every good fence is putting “money” into your horse so when you have to make a withdrawal at a questionable ride or fence, the horse gives you the benefit.
I suspect the rider, getting through the first combination, overlooked the table as an “easy” ride and was more intent on the next combination. They missed the tiny details that made that fence not a “let up.” It was one that needed the rider to be forward but not one where a gap distance is the option. As seen in the video, the ride was to come forward to a close distance with no pulling on the reins, keep the body quite and let the horse workout takeoff while the rider supports that.
The fence was an appropriate “trick” at this level. It was a fair question that could allow a horse a break between harder questions, but still had to be ridden with intent and attention.