Despite assertions on AB, there has yet to be any real demonstration that No Deal *was* the will of the people -- and, more profoundly, any assertion that this is all the justification that is needed to pursue a policy that is so damaging for our future. As a result, rejecting No Deal is not "overturning the result of the referendum". As to the claim that a second vote is not a democracy: any referendum held in the future will be presented to a different electorate, both in the very literal sense that many of the actual voters will be different people, and in the sense that they have had at least three years' more time between the votes, during which a great deal has happened. Whether or not this changes anyone's minds is immaterial; it is enough that such events *could* change their mind (in either direction!).
There is no definition of democracy, in the entire history of that practice of government, that excludes a second vote on any given issue. Indeed, the idea that a vote, once made, can never be unmade, goes against the idea of democracy far more than the other way round, for then the future electorate must forever be slaves to its past, and never able to change its mind in the face of changing events. As David Davis said, a democracy that is not permitted to change its mind is no longer a democracy.