Apart from that I get the sense from this article that the author is scanning articles at the checkout counter instead of scanning them during the shopping proc

Apart from that I get the sense from this article that the author is scanning articles at the checkout counter instead of scanning them during the shopping process itself. Either by using a handset supplied by the store or with a mobile app (which the Albert Heijn both offers). When you're done, it's simply a matter of scanning your customer loyalty card and pay. Ofc random checks are part of the process.