I did a rough estimation, as I'm bad at math, but I deduced that Tatis would likely make a bit over 50 million in his next 5 years of team control that are being waived in lieu of this contract. So, essentially, this can be viewed as an approx 9/290 ish contract, amounting to a bit over 30 million per year.
Seems unnecessary.
I just want to point out that this, imo, doesn't make the Acuna contract bad, this contract is horribly one sided. You make a deal like this to trade risk on a long term deal for potential savings. Unless they are expecting the next Alex Rodriguez here, I don't really see much upside financially for San Diego. Dumb contract from a dumb team.