You don't understand what the concept of 'no trust' means. It means that you can verify the cryptography yourself on your own computer, generally using a program (although in theory you could do it by hand on paper). Without doing that you have no way to do know that a blockchain (be it Dash or Bitcoin or Monero) is valid. Once you do that, you do know it is valid.

It especially does NOT mean that you trust masternodes to not reveal the mixing they are doing for you, and without that Dash is no better than Bitcoin terms of privacy. It is either not trustless or completely worthless.