> a fundamental requirement to do quantum computing
Yes, and it's a necessary, but not sufficient requirement. They don't have a quantum computer by the usual meanning of that term, but they have a different kind of computer, that may or may not do something better than a normal computer.
1) D-Wave devices have finally been proven to meet a fundamental requirement to do quantum computing. This is a significant scientific advancement.
2) Despite this, they don't seem to answer any computational questions more quickly than commodity electronic computers.
Again, I'm not an expert. The author's reasoning does seem sound. Still, I'm not qualified to assess either of those claims directly.