Sounds impressive and I have no idea how the calculations are made.
This year's Tigers check in at #10 with:
91.9% chance of winning at least six games;
2.5% chance of winning the SECW
0.5% chance of winning the SEC
2.7% chance of making the playoffs
0.8% chance of making the Championship game
0.2% chance of winning the Natty.
This index predicts that no one outside the top 20 has a statistical chance of winning the NC. Oh, and we have the #1 SOS.
https://www.espn.com/college-football/fpi