Said another way, when Alabama does lose, it's usually to a champion. Of Alabama's 18 losses since the 2008 season, 9 were to championship-level teams: 6 were to teams that won the National Championship, 2 more were to teams that played for the National Championship, and 1 was to an Auburn team that won the SEC West.
2008 - Lost to Florida, which won the National Championship
2010 - Lost to Auburn, which won the National Championship
2011 - Lost to LSU, which won the SEC Championship, and played for the National Championship, losing to Alabama
2013 - Lost to Auburn, which won the SEC Championship, and played for the National Championship, losing to FSU
2014 - Lost to Ohio State, which won the National Championship
2016 - Lost to Clemson, which won the National Championship
2017 - Lost to Auburn, which played for the SEC Championship, losing to UGA
2018 - Lost to Clemson, which won the National Championship
2019 - Lost to LSU, which won the National Championship