The linked page explains that fact checks aren't guaranteed to be displayed, but use an algorithm similar to page rank to choose which if any checks should be s

The linked page explains that fact checks aren't guaranteed to be displayed, but use an algorithm similar to page rank to choose which if any checks should be shown. Fact checking doesn't automatically mean people will believe the fact checker over the top link anyways. Exposing people to disagreement to the issue from the start may be important because once people form a belief, they're much more likely to hold that believe despite contradictory evidence.