The article actually claims that "One of the most common extramission beliefs is that people can “feel” someone else’s gaze as a pressure or heat on the skin."

The article actually claims that "One of the most common extramission beliefs is that people can “feel” someone else’s gaze as a pressure or heat on the skin." so I don't think your original point (that people were more likely to be tracking gaze to anticipate action) corresponds to the facts. Now, the claim I've quoted could be false, but it's not presented as a hypothesis, but as an explanandum.