Core part of the article is at the bottom: > TorrentFreak reached out to DuckDuckGo to discover why these domain names are not showing up in its search results

Core part of the article is at the bottom: > TorrentFreak reached out to DuckDuckGo to discover why these domain names are not showing up in its search results. At the time of publication, we have yet to hear back. It wouldn’t be a surprise if the move is copyright-related, though. So there isn't anything else known than "domains are delisted".