This is a little disingenuous. As far as I know, v3 isn't going anywhere. There's what... weeks until May 2025, which would be four years?
4 years in JavaScript land is actually pretty long. Zod has a pretty good maintenance record. I don't see how a statement like yours can be made without snark. Calling it a "throw-away" library is pretty brash.
This looks like a good update that sticks to the formula.