for descriptivists, this is ample evidence that somebody is using it.

I suppose, if someone is using it, a descriptivist would be remiss in saying that nobody was using it. Shouldn't stop a prescriptivist from saying that anyone caught using it should be drawn, quartered, and cast into the pits of Gehenna.

On the other hand, I could easy imagine a fine distinction between honesty and honestness. Not that we could get any two people to agree on what that distinction was, mind.