Per multiple opinions I got from people whose job was to advise me on the matter, a 2016 ECJ ruling[0] suggests that it doesn't matter if a provider can find a person from their IP address or any other detail, but that there exists a scenario where it is possible.
I am not sure how the CCPA treats IP address, but unless you're at Google or Facebook, it doesn't matter. Few can afford to build separately for the EU and the rest of the world, and hence err on adapting the strictest interpretation.
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[0] https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...