Last year's offense:
4014 passing yards (13th in NFL)
20 passing TDs (26th in NFL)
6.5 net yards per attempt (16th)
372 points (22nd in NFL)
This year:
4141 passing yards (6th in NFL)
36 passing TDs (2nd in NFL)
7.3 net passing yards per attempt (2nd)
416 points (6th in NFL)
Let's not forget how gross our offense was last year. 20th in yards per attempt, 22nd in passer rating. This year, we're 3rd in both. Last year, the Rams were tied for 12th out of the 14 playoff teams in passer rating, 11th in yards per attempt. In other words, the Rams had one of the worst passing attacks out of any team that made the playoffs.
In 2020 it was the defense and running game that lifted the team to the playoffs. This year the Rams passing game is its strongest asset and has lifted the Rams to 1st place in spite of a defense that fell from no 1 to middle of the pack, injuries to the RBs and outside of Matt Gay, not so hot special teams.
There has not been a reversal in the decline of Jared Goff, the player. They were going to move on from him anyway. If they hadn't done it last year, that's what would be dominating the board conversation again. They got someone to take on his contract and they got an upgrade, substantial, by the numbers.