Sorry I explained myself poorly: I wasn't saying that a superette wasn't a supermarket, I was pointing out that OP curious remark about superette being a "small big shop" wasn't as contradictory as it seems.

Also, while we're digging Wikipedia: the French one points to the national statistic institute that have a definition of an hypermarket as "non specialized store that's over 2 500 m^2 in surface and make more than a third of their revenue from food".