The publication of the triage was under Biden. They had leeway to change the DV classification if they wanted..but didn’t. They didn’t just take everything else over and apply it unthinkingly, so I don’t personally accept the argument that they just adopted the prior framework unthinkingly. For example the Biden admin brought fiancé visas into the top priority tier where they had not been there before. But anyway there are so many ways to argue this. The fact that immediate relative family categories don’t have a visa wait is a clear priority established in law. Any kind of first come first served date wise, which is also a valid argument for priority, works against DV. You would have to actively make the argument that DV should be prioritized over these others. And one can certainly make a valid argument for that because of the sunset clause, but I don’t see how you can legally show it is more or less valid than any of the other arguments for priority.
Don’t get me wrong - I’d love to see this lawsuit succeed. I just have doubts.