Ah, you're right, I misinterpreted that.

It does still assume though that the effect allows one to predict better than chance where the image will appear regardless of the process that determines the location.

Suppose humans had some sort of telepathy that allowed them to read the state of the computer on some subconscious level and thereby predict the location where the image would appear, if the location were determined by the computer that was displaying the images. Predicting corporate earning announcements, interest rate changes, etc. would be an entirely different matter.