Well, after going beyond the 11th nyana (Equanimity regarding formations) for the first time and attaining cessation or nibbana, the momentary cessation of mind&body, one is in what's often called a 'Review phase', that is, one can attain Fruition of first path at will, but it takes practice.
After Kenneth attained first path, Sayadaw U Kundala (Mahasi tradition lineage holder) taught him to pay close attention to the sudden ending of sensations, in order to induce cessation, or fruition. He found that observing closely eye flickering is a good technique of attaining cessation (after one has attained first path already).
So while it does work for those who have attained first path at least, it does not work for those who did not, that is why it seems like nothing to you, because you have probably yet to attain first path.
You can find references to this technique in the suttas themselves, where it instructs one to pay close attention to the cessation of sensations. The only difference is that the instruction here is to notice it about sensations in a specific physical area.
Now, I hope that answers your question. I don't see anything else I can contribute to this thread. I hope you got my message (always make room for the possibility that you are wrong, or that you may change your opinion later).
Have a good happy day