2017 National Champ. Look it up in the NCAA record book. There is no delusion. Bama was 3-8 in 2002/3 when we beat them. Does that mean all their Natty's afterwards don't count? Go suck a D, and educate yourself about college football and what it means to have roster turnover and player development. When you have 18-19 year olds playing a lot, it's likely you get beat by a team (especially on the road in conference play) by a team that may be loaded with 21-23 year olds. College football isn't the NFL.
Reality:
2017: 13-0 (Conference Title)
2018: 12-1 (Conference Title)
2019: 10-3
2020: ?
Over that same span there are probably 4 teams with a better record: Bama, Clemson, Ohio State, and Oklahoma. Maybe another team or 2...maybe??? Nobody but Bama, Clemson and Ohio State gets to do what they do, and that is because every year their teams are riddled with 4/5-star depth up and down their rosters...every position. They don't have to go through cycles of up and down like everybody else.
Even Notre Dame was 4-8 in 2016, then 10-3, then 12-1, then 11-2. They have a very senior-laden roster this season. I would expect them to continue to win.