I am not incredulous and neither, I believe, is the article's author. You are arguing besides the point.

This is not about you or D-wave. Instead it is like there is a shop with so little supervision that every customer has to be trusted to not steal things. So if a customer asks: "What can I do to convince the world that I am not stealing?" then the answer is clear: you either show your shopping bag to everyone in the world, or we need an entirely different kind of shop.

The point of this part of the article is that, for quantum computing, there is an equivalent structural problem. Until it is absolutely manifest that quantum computers do useful things that classical computers cannot, the potential for fraud remains real.