Sorry I'm late to this discussion - the stamp itself appears to be attached to a credit-card size memento while the collectability is there are just 2071 units on offer (the 2071 caught my eye Are the items numbered? 2067 would be a cool serial to add to the collection) and the website selling the item is touting there is also an NFT that is included in the package, so it's not just a stamp, hence the Euro Customs (probably) considers it to be e.g. a physical thing, not a stamp per-Se.
https://www.emiratespostshop.ae/product/projects-of-the-50th/
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There are 2071 NFT stamps issued in this design.
The price is out of my range, but it's an interesting collectable.