The court didn’t address that at all.
Days Before Expected SCOTUS Ruling, Appellate Judges Send 2020 Census Lawsuit Back to Lower Court
https://ktla.com/2019/06/26/supreme-court-to-decide-whether-to-allow-citizenship-question-in-2020-census-on-thursday/
The SCOTUS usually want all evidence and arguments to go through the lower courts first.