this is true and shows just how shitty the Lions players and front offices have been over the past 15 years. A fact that you seem to have been disputing.
2005-2009 a mess. 2010 still part of rebuild and Stafford hurt all year. I never ever argued they were good in those years.
There are years there was support. 2011, 2014, 2016. Playoff years. 2019 a lost year with Stafford injury too but no support
So boils down to 2012 (bad defense, weapon injuries/caused turnovers), 2013(average defense, some run game, but weapon caused turnovers and injuries), 2015, 2017 (close and winning record), 2018 and now 2020.
2012 4-4 then fell apart with turnovers (special teams cost them 2 games gave up like 2 returns a game in two games), injuries to all weapons and couldn't get it done on defense in 4th Quarter
2013 same as 2012 but 7-9 with 6-3 start. Weapon injuries and weapon caused turnovers galore. Failed down the stretch and dumped Schwartz. Semblance of run game with Bus/Bell though
And those 2 years were before Caldwell really fixed Staffords mechanics too
2015 terrible first half, (coaching OC Lombardi and Oline), 6-2 second half when change made
2017 9-7. Razor close to playoffs. 10 second run off game basically cost them. Stafford did well despite lack of support.
2018 Cooter got predictable, defense actually 13th in PPG. But Patricia making changes.
2020 defense is atrocious, run game without Swift atrocious, KG hurt 7 games, defense some big injuries at Dline/CB too most of year. 5-7 and see how they finish under Bevell
Some coaching (Lombardi mess (2015) and predictable Cooter 2018, Patricia defenses 2018-2020), some weapon caused turnovers (2012/2013), some major injuries to most important players or just a plethora in same spot (weapons 2012/2013), some just a slight lack of execution(2017), some Stafford injury (2019)
TLDR: Issue was coaching and massive injuries