Pretty impressive that he has 129 wins at Miami already. You'd figure his win rate would have gone down against "better" coaching/competition.
It has in conference to some degree...but Miami gets to schedule more home games with cupcakes earlier in the season. Like this season, they went 10-2 in OOC with home games against Western Carolina (3-10), North Florida (1-12), Wofford (3-9), South Carolina State (1-10), Florida Atlantic (2-9), and Columbia (4-7).
Of course, we can't say much on that front this year.
Basically, though, Coach L is a good coach and would have succeeded anywhere. Good for him.