It is difficult to tell from that code diff if X-Twitter is blocking #nostr, since

1. "nostr" is not a url

2. there are many nostr urls

They blocked Mastodon urls so they could block nostr ones too of course.

I did find blue to give quite a few interesting benefits and on the whole it improved since Musk took over, but I did get throttled 3 times even while paying for Blue...