Is this a real certificate?

The seller downloads the aliexpress website
 certificate and confirms that it allows you to sell to him the goods on the site elixpress. However, in the description, he hides the name of your brand, it seemed very strange to me. He confirms that the Chinese office of the company Dell issued this certificate to him.
I have suspicions that he simply took someone else's certificate and issued it for his. Did you issue this certificate to this seller? Or he uses someone else's certificate? This certificate has something to do with this seller on the website?

https://chinabrand.aliexpress.com/store/232223