Which is exactly the point - under Article 21 of the GDPR every person has a legal right not to be subjected to direct marketing so any forced direct marketing is unlawful and consent cannot be bundled (it must be specific under the GDPR) so bundling consent to direct marketing along with consent to join the Club is not lawful.
The point in this subthread is that your article says the opposite of what you appear to have meant. You don't provide anything other than what is apparently a very bad English translation. The rest of the article makes it pretty clear that you meant to write something different, but it threw me for a loop when I read it and clearly I am not alone.
This is why, when I'm reporting my translation of something in a foreign language, I tend to include the original text too.
* Published benefits: https://web.archive.org/web/20220613175535/https:/www.elkjop... (e.g. "Rabatt på en rekke av våre tjenester utført i varehus", i.e. something like "Discount on a number of our services performed in warehouses")
* Conditions to join, i.e. to receive the benefits (DPA's translation):
* You may be contacted electronically (e.g via SMS and e-mail), via phone and mail with personal offers and other relevant information
* Collect and analyse information about you and your customer relationship.
* Create a customer profile, in order to provide more relevant information and a better service.
* You have to be minimum 15 years old and you can choose to leave the customer club at any time.
So to get the discount you would need to consent to being contacted for "personal offers and other relevant information".