In totality, I agree with you.
The narrative difference is that Baker was a LOT better in 2020 than he was in 2019, while Lamar wasn't as good by any metric. He wasn't bad by any metric, he just wasn't as good.
But I do agree that Baker in 2020, being "good", was about the same as a passer as 2020 Lamar, which was considered "a down year".
Reflection of one guy being an MVP in 2019 and the other being replacement level that year, which is what Baker was.
So struggling Lamar = makes no sense. Regression is kind of impossible to argue, based on statistical performance. But again, that's off a higher comp.