Because JS would not have been pushing buttons then.
Why would that be interesting?
It would be interesting to see video of the foil tops when JS was running from one side of the boat to the other.
However I am told that Simeon Tienpont's cockpit controlled the foils during that time. So, it would in fact not prove anything.
That seems to leave when it was "sitting" not racing as the only time foil top adjustment might be telling.
AFIK, a person had control of a helm and access to the buttons at all times. I find it hard to believe that wouldn't have been the case even between the races if they were anywhere near powered up. I heard a lot of "go button" commands but nobody was yelling "look ma, no hands!"
Between races in displacement mode, "sitting," would a probably designed system be moving the board pitch frequently?
At speed, I think you'd have to prove that any visible movement wasn't the result of the system correcting for compression, leakage, flex and so on. A little jiggling could be the system getting off of it's set point and then returning. Looking at Xlot's chart there is, as expected, only a couple of degrees of pitch range when flying. So the motion you are looking for is going to be small wrt the bounces and jitters of the boat and video.
If excessive pitch control frequency was obvious from the video and given the rumors at the time surely ETNZ would have protested. GD is no shrinking violet.