Earlier quoted context omitted.
I don't think the plate itself is PII, like "158.32.44.25" isn't PII. Tying that to a person is what's PII.
It should be PII, otherwise I can put cameras all over the city, log license plates, and sell service for you to query. I think PII according to GDPR is something you can go back to identify a person.
This exists and it’s a very profitable business:
https://www.engadget.com/2019-09-17-repo-drivers-scan-licens...
I think it’s about $20 per query to track a known plate.