I agree about this accidental pressing on the switch but I also find this uncommanded motion of trim very hard to swallow. We better have a theory why their vertical speed varied widely from +6000 fpm down to +2000 fpm and then up again to +4000 fpm (all within about 75 sec) to finally plummet to negative values. I don't see how uncommanded trim motion in the same direction would help explaining that.