Maybe true, but the issue here is that you don't know who / what the companies are, if they are gathering the data to store.

According to ChatGPT:

Why a License Plate is Considered PII:

• Identifiability:
  A license plate is a unique identifier associated with a specific vehicle. While the license plate itself may not directly identify an individual, it can often be linked to the owner of the vehicle through registration records. If an organization has access to those records or the ability to link the plate to an individual, the license plate becomes personally identifiable information.

So a license plate could be considered PII, so it would be contingent on if they were storing the data.