It's true that this case isn't really about CDL, but it's also not just about the EL.

It's not about CDL because it's very specifically focused on Open Library's specific implementation, Open Library. Nobody is suing Hoopla or OverDrive. The courts are openly acknowledging that by explicitly spelling out why this ruling only applies to Open Library and not to other well-known CDLs.

And the Emergency Library was just the concrete pressure pipe that broke the camel's back. Publishers and author's unions had reportedly been trying to negotiate with IA about OL all along, and EL was just the move that prompted them to stop playing nice and take it to court. The rulings don't need to focus on EL, though, because a ruling against the aspects of OL that are under contention would automatically apply to EL as well.