24 games, out of how many total? In my view, an anomaly.
As a sidebar, how many of those teams ended up winning the Superbowl?
2008; Steelers 1 loss, CHAMPS.
2009; Saints 1 loss, CHAMPS.
2010; Steelers 2 losses, CHAMPS.
2011; Giants 4 loses, CHAMPS (really unusual).
2012; Ravens 2 losses, CHAMPS.
2013; Seahawks 1 loss , CHAMPS.
2014; Patriots 2 losses, CHAMPS.
2015; Broncos 1 loss, CHAMPS.
2016; Patriots 1 loss, CHAMPS.
2017; Eagles 1 loss, CHAMPS.
Let's brake it down. I count 24 TOTAL double digit losses by Superbowl teams. 24/320 games....(.075%). Very low. And add in, by your account, 3 teams rested their starters.
16 total losses by double digits over the last 10 SUPERBOWL CHAMPIONS, 4 of which, were by the Giants! 16/320...(.05%).
I say it is safe to say, losing by double digits in a regular season game, is an anomaly for a Superbowl team and even more so, for a Superbowl Champion. That's just me. But hey; you can look at it any way you want.
Like I said. IT DOES happen, but is rare. I did not say; IT DOES NOT happen. By your stats, it IS rare.