I don't see GIS mentioned once in the ruling. Here it is for your interest.
As I'd summarize it, the Court merely reaffirmed its existing precedents, saying that while Alabama challenged the old rulings, no, the old rulings were legit.
It wasn't really about any new technology but just about reviewing old decisions and saying they had them right the first time.
https://www.supremecourt.gov/opinions/22pdf/21-1086_1co6.pdf