It is a little confusing, they ruled that the search was not legitimate, but this didn’t end up helping the defendant? I’m definitely missing an important nuance here but I’m not sure what it is…
The judge doesn't care if the law was violated in collecting evidence.
I think they left it to the lower court to decide if the search was legitimate in particular. They ruled in general that geo-fence warrants are not OK. Not a lawyer though!
They ruled that this kind of search, going forward, is illegal. But this wasn’t clear at the time of the investigation, and the cops did what they genuinely thought was best practices for respecting the 4th amendment. So evidence in this case (and prior cases) is ok, but not in the future.