How about the first sentence in the body of the paper? > In nature, all motion can be described by the principle of least action: motion minimizes action. It

How about the first sentence in the body of the paper? > In nature, all motion can be described by the principle of least action: motion minimizes action. It is wrong. The actual principle is that the trajectories are stationary points of the action - not minima. (Edit: It is wrong even with the "locality" caveat that the author later adds.)