That photo shows the pallet DOES have 1x4 cross member planks on the underside. which raise the 2x4 east-west running members off the floor by 1/4 “.
However the only way there’s any chance at all for Weitzman to have LOS thru the 1/4” gap would be to have his cheek literally touching the ground so his eye could be 1/8th” off the ground AND he would have to be located at the SW corner of the pallet looking directly North AND there would have to be some vertical gap between the row of boxes on the North side of the pallet from which one box was removed to allow the photo of a portion of the rifle.
I’m going to have to take Walt’s word for it that you can’t get your eye close enough to the floor to have a parallel LOS across 4ft of floor under a pallet that’s only 1/4” off the ground.