NTs probably are significantly less able to pick up on subtle, almost subconscious clues like microexpressions. That should be highlighted by a test like this, which focuses on small differences in the eyes that many will be unable to discern (or attach a meaning to).
I'm not that bad at reading people myself, but it is more learned than innate: I look for broader signals, ones that are most pronounced over time (in motion) rather than in a snapshot. Similarly, autistic people are known to focus more on the mouth area than the eyes when trying to read emotions, probably because the mouth initially would seem to be the most expressive part (bigger, and moving and changing shape much more).