I use DDG on Android and it works pretty well there. I also saw this line in the article and it's somewhat of a stretch to call DDG either a "major" browser (as you point out) or a "non-Chromium browser". My understanding is it uses the browser engine bundled with the OS on Android/iOS/Mac/Windows and it isn't available for Linux.

The wikipedia article on it says:

> The core browser functionality is the WebView component provided by the operating system. This means the browser engine is Blink on Android and Windows, and WebKit on iOS and macOS.