An interesting insight into a characteristic of landing a Delta Christiaan! In fact, it looks like the first “excursion” was a reduction in pitch which ties in with your info on the “pitch down” Moment generated in GE.
Would the Pitch Moment be due a “cushion” building up mainly towards the rear of the wing which is where the greatest span is? I would suspect that, in a Delta, Lift/CP itself remains fairly unaffected in GE since it will be almost pure Vortex lift at that point but that is only based on some wind tunnel work I did on the Harrier LERX a few years ago. Clearly, that was a hybrid situation I was looking at. All interesting stuff!
As you say Rainboe, who knows what is real these days.