If they'd had Tennessee's schedule, my guess is that they'd also be around 10-2. Tennessee won 2 games against teams with winning records. Their non--con opponents records were a combined 11-38. Overall record of opponents was 62-84 (.425).
As I've stated, there just aren't enough games inter-conference to statistically say much about relative conference strength. Every year you get a few select non--con games matching upper level teams, but it's a very small sample size, relatively speaking. How many out-of-conference games were there among the 12 playoff teams? I can think of 2 (UGA v Clemson and Oregon v BSU -- both very early in the season).
And, in a sport where rosters completely turn over every 4 years, players continuously move via the portal, and coaches get poached and fired left and right, prior year results are no longer a significant consideration. Look at Arizona State -- door mat (3-9) in the P12 last year and now in the playoffs. Or Indiana -- a great coaching hire and portal raid turns them from 3-9 to an 11-1 playoff team (with 20 former G5 players on their roster). On the flip side, FSU -- undefeated last year and can't get out of their own way this year.
CFB has changed considerably. IMO, mostly for the worse. Not a big fan of regional conference destruction nor the current implementation of the portal or NIL. But expanding the playoff was a change for the better. There's no perfect number of playoff teams, but I'd rather err on the side of including more teams than excluding undefeated and/or deserving teams. What happened to FSU last year was borderline criminal. And what's so bad about more college football?