Oakland 2007 -- 4-12
Oakland 2008 -- tbh, he didn't get through even half the season before being fired, so let's skip this one (but 1-3)
Vols 2009 -- 7-6
USCw 2012 -- 7-6
USCw 2013 -- again, fired less than halfway through the season, but for the record, 3-2
FAU 2018 -- 5-7
Ole Miss 2020 -- 5-5
So when you say "only one losing season" you are so barely, technically right. As long you only count college jobs, not NFL. And as long as you ignore that a 5-5 season, as well as a 7-6 and another 7-6 are all a sneeze above a losing season but yep, not actually losing. And as long as you don't count those years he got fired against him.
So if you squint your eyes really super tight so you can pretend to ignore all the crap littering his career, yep. You're right. Just one losing season.
He must be awesome.