Very much this.
The problem I have with this article is that it's basically pointing out a tautology. The kind of fusion created by slamming atoms together at high speed (in other words, high temperature fusion) can't be done at low temperatures. OK, but we have empirical evidence of other mechanisms for causing fusion.
Other forms of catalyzed fusion, if they exist, probably also require some pretty exotic physics, or we'd see lots of evidence of unusually high energy output in nature.