Brian
Miller writes: Postdiction is an explanation after the event: the lamest and laziest form of prophecy.
In skepticism, it is considered an effect of hindsight-bias that (only afterwards) explains claimed predictions of significant events.
Happens often at
race-tracks and masked wine tastings.
Larry Lockshin adds: "I knew it." Used extensively in business case studies, which often purport to cause and effect: they did this, and that happened.
It is not a predictor of outcomes for those following the claims.