I think you are missing the point.
City didn't have a problem with the original rules. The club even voted for them in principle and didn't vote against them in 2021. It was the 2023 rules that led to the tribunal.
When it came to making the claim, of course the club aimed high against the original rules as well as the new rules. Why not? You never know. It's the equivalent of the 115 charges. I doubt the club really thought they could throw out all the rules, but they seem to have had success on the new rules they voted against and on the deals that were delayed. Which is a win for the club and a problem for the PL.
The PL can claim that as a victory if they want, but it is hugely embarrassing for them to have their legal opinion, that was paraded around all the clubs, reversed on appeal on any issue at all. And not for the first time.