It won't, but it hasn't happened yet. Slasher's rankings and the other site are just projections, predicting what the ATP will do. It causes celebration, and rightly so, but it isn't official until the ATP says so. Its like the USA's elections, where the results of the states are projected, and the candidates 'win' and celebrate on those projections, but it isn't official until the Electoral College announces those results.
Oh my, it's not just a projection, those are the most official accurate up to date rankings each day, the election analogy is about as bad as it gets.