That page basically confirms this. It says:

> To do that, we've developed an open source Instant Answer platform called DuckDuckHack,

which links to https://duckduckhack.com/ which says "DuckDuckHack is now in Maintenance Mode".

And the "four hundred sources" link links to 400 special case replies. They are probably useful, but fire rarely. It's basically Bing, and that page is a bunch of spin.