About non-stick pan, its a matter of do you know how to properly use them or not.

Tefal, works well for my pan, but not for my housemate because they put too much heat on it, the coating spoiled even they bought it 2 years later than mine

In my opinion, these guy did not intent to keep the wok for long term use and it wasn't his wok as well, so he can simply abuse them.

Those tefal wok also can withstand those rough sponge scratch and it is still non-stick, but it will not last, so by the time it's starting to stick, the salesman just change another new wok will do