According to the seller, this has been replaced and is fully functional.

Thank you for pointing this out, we have gladly forwarded the information to the responsible department. According to our information from the provider, it is the iPhone 11 without Pro.

This means sold by someone who re-furbished a product. It is not a factory produced brand new one. If done correctly, nothing against this, and if the warranty coverage is decent, this should not cause any issues. It could be a returned by a customer product.