Sadly, that is not the case. The only thing they do is ensure that the connections used are encrypted by means of TLS. The same applies both for the standard and hidden service versions. This shouldn't be suprising, seing how the services accessed aren't hidden services themselves. Thus, there is no difference between using e.g. !g via DuckDuckGo and accessing Google directly.
I think you are thinking back to Disconnect.me which was the standard search engine in the TBB for a while though most of their search related services have been discontinued as Google and other made it harder to use their services in such ways. They actually used their own servers to transmit search requests as to keep users information more private.
Have a nice day,