I can only say that Purdy is not going to win MVP
49ers are too stacked + the mid season slump where he "only" had CMC, Aiyuk, and Kittle (which is a skill position group most teams would kill for).
This also feels like over fitting data to history - good QBs tend to have good advanced stats, but that's a correlation, not causation, relationship.
I think it's borderline impossible to argue that there's a contract worse than it, in league history, through the first two years.
Because of the guarantees, he'll see out the contract and potentially have a chance to make it better, but through two years - yeah it's by far the worst.