Can a lawfag help me understand why this case in the 9th circuit court Mark Trudeau v google llc is siting United States v. Sineneng-

Smith which was just kiced back to the 9th circuit from the supreme court. What does GOOGLES terms of service have to do with a case about sanctuary cities?

https://cdn.ca9.uscourts.gov/datastore/memoranda/2020/05/22/18-17022.pdf