Wow! I have too many things going on... I should have simply referred to my own post from mid-November here, because at some point in January I was under the impression that I still hadn't received my gold card... I even called Aegean to tell them that and they responded, that they could only see, that the physical card was sent to me via postal services and couldn't track it from there.
They suggested that I request the physical card once more, which I did. It arrived last week (so this time it took at least 4-5 weeks for the card to reach me) and in the end it was actually a good thing to order the physical card again, because this time it came with the extended expiration date (Sep. 2023) printed on it ​​​​​​.