It's not "made by a third party" - it's sold as a first-party add-on, by Raspberry Pi on their own website, in a Raspberry Pi branded package.

https://www.raspberrypi.com/products/ai-hat-plus-2/

It's no more "made by a third party" than any other electronics device made by a contract manufacturer.

Oh, I did not realize it was getting that first class treatment, I thought (from only reading the article) that this was just a hat made by a third party and sold for the ecosystem.