Not really sure what you mean, OP. Every link seems to work okay:
https://www.google.com/search?q=piefed

E.g. top indexed link works for me over here: (but not you?)
https://joinfediverse.wiki/PieFed

That said, I love the concept of DDG, but sadly, it just doesn't return as robust a result as Google routinely does for me. 😕 I also used to use DogPile FWIW, which tapped a dozen+ search engines. Are they still around?

I've also heard some good things about SearX search, again FWIW...