This article and the discussed work was put out last December (see <a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1512.02206" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1512.02206</a>). Scott Aaronson weighed in around that time; see <a href="http:&#x2F;&#x2F;www.scottaaronson.com&#x2F;blog&#x2F;?p=2555" rel="nofollow">http:&#x2F;&#x2F;www.scottaaronson.com&#x2F;blog&#x2F;?p=2555</a>.