I think what may be confusing some folks - is the fact they can't clearly see there is a CENTER support on each pallet, and a sheet of material bridging the THREE pallet riser beams.
The end of the center support is covered in part by the I.D. label..
This center support would make it possible to stack the shown number of gold bars in the manner shown -- assuming wooden beams and bridging sheets of suitable material and condition.
Semper Fi
I see the three risers, but still, the load does not extend out over the side risers. It's a sheer strength problem, not only compression. The sheer strength of those horizontal wooden floors is only a fraction of their compressive strength.