That Graph was used from a source and is accurate in terms of how the Packers Total Offense Performed in 2017 and back to the 2009 Season.
It's not calculated then drawn specifically (just for games that Aaron Rodgers) played.
From PRO FOOTBALL Reference the 2017 Season:
Points For: Total Points at 320 (20.0/g) or Ranked 21st in the NFL.
https://www.pro-football-reference.c...s/gnb/2017.htm