I'm having a really hard time seeing this as something that should just be knee-jerk dismissed as hate. Frankly, speculating on the author's motives isn't even a particularly useful line of thought. Bitcoin is supposed to be all about resiliency. And the way you achieve resiliency is by continually running thought experiments to try and probe for possible weaknesses.

This article may seem far-fetched right now, but it's amazing how often novel new large-scale attacks turn out to contain elements that featured in speculative writing that was previously dismissed as being far-fetched.