Not particularly relevant to the article, but a fun fact is that in France -- there's no such thing as after hours reseting in grocery stores. When the store closes -- everyone goes home.
A lot of grocery stores have non-employees stocking shelves now, usually during the day. These are reps from the vendors, like potato chips or specialty foods that rent shelf space in the store are and responsible for maintaining them.
The thing is too, it's a snapshot. We don't know how long it looked like that, what time of the day it was, whether someone called out sick, etc.