Not at all. The difference between a centralized social media platform like Twitter and something decentralized like Nostr is that instead of all information being stored in one place it’s all over the internet.

For example, to get my NIP-05 your client had to contact my website and check my JSON file. This is by design and isn’t a bad thing. If you want to be able to watch a video someone sent that’s hosted on nostr.build, your client will also have to contact that website.

Damus is simply retrieving information stored in many different places. This is the definition of decentralization.