The Patriots hadn't played the Titans, Jaguars, and Eagles since 2015, but that's their playoff run this year. The teams to beat the Patriots in the playoffs have always had a history of playing well against New England. Think of Mike Shanahan's Denver teams, any team with Peyton Manning, the Giants, John Harbaugh/Joe Flacco-era Ravens, and even Rex Ryan's Jets went 3-2 against the Patriots in 2009-2010. Add it all together, and you have this most interesting split: the Patriots are 15-0 in the playoffs against new opponents and 12-9 in rematches.
As daunting as that sounds for the Eagles, the DVOA splits and distribution of close wins shows that the Patriots aren't invincible in these matchups, but it will take quite the effort from a Philadelphia team that is simply not used to this stage or opponent.