That chaotic storage technique makes sense. I'm sure that eliminates virtually all, "You sent me BZqX114, and I ordered BZpX114! This is an outrage!"
I would imagine they probably had to spend a bit more time 'randomizing' or scattering the different products around in the warehouse rather than putting similar items all in the same spot, but this takes a lot of potential error out of the picture.
It makes sense to a point. However some mistakes are still made, I have received books in French and not English but they accepted return of item without cost. The only aspect that baffles me is how they assure stock is rotated. There may be a warranty expiry date on the product. Not all products have warranties but those that do will need to be rotated.
If they want holy water, tell them to boil the hell out of it.