I don't think the title implies that Google is tracking DuckDuckGo searches directly, just that using DuckDuckGo instead of Google often doesn't prevent Google from tracking you. The article also makes clear that using DuckDuckGo is an improvement, just not enough.
Furthermore, I don't see any intimation in the article that Google owns DuckDuckGo.
All in all, it seems you and the article are on the same page.
Furthermore, I don't see any intimation in the article that Google owns DuckDuckGo.
All in all, it seems you and the article are on the same page.