But crucially, the police used the ALPR data without a warrant. Regardless of the rental car, the police did use ALPR data without a warrant and the court did allow that to be used in court.
It's still a court that came down in favor of warrantless use of ALPR data, even if the situation around the overdue rental car might limit it's application more broadly.
... the entire point of the decision was whether a person has an expectation of privacy in a rental car outside of the rental period.
The court didn't come down in favor of warrantless use of ALPR data. It said that the defendant did not have standing to challenge the use of ALPR data, warrant or not, because said person had no expectation of privacy in a vehicle they had no legal claim to during the period the data covered.
FFS, the court, in the opinion, which you linked to prove you're smart, quoted, verbatim:
"We do not address the potential Fourth Amendment privacy interests that may be implicated by the warrantless use of this ALPR technology because we conclude that Yang does not have a reasonable expectation of privacy in the historical location data of the Yukon under the facts of this case."
The court ruled, as hundreds of cases have been ruled before, that Fourth Amendment protections only apply if there is an expectation of privacy. Its opinion made clear that they were ignoring whether warrantless use of APLR data is a Fourth Amendment issue because you can't have a Fourth Amendment issue if there is no expectation of privacy and there can be no expectation of privacy in Yang's specific situation.
It didn't uphold the use of the data. It said it didn't need to address the use of the data, because it was a moot point.
This is like arguing with someone that a court didn't say Dragons couldn't be charged with a crime because the court only said Dragons aren't real.
The Ninth Circuit in US v Yang specifically did not rule on the applicability of Carpenter or whether ALPR's GPS database was sufficiently similar.
It ruled Yang lacked standing to sue on those grounds because you don't have any expectation of privacy in a rental car after you've turned it in.
It ... has absolutely nothing to do with anything.
I helpfully pointed out the actual case you should cite in a different comment.
Try Googling that one.