That isn’t how the Wyze AI works. The AI server interrogates all objects within the field of view regardless of their motion status. The objects that are moving may initiate the motion event upload, but once that upload is initiated and sent to the server, the AI does not discriminate between moving and stationary. It also doesn’t limit tagging to only the motion object that started the event. The cars are still vehicles even if they aren’t moving.
There is a Wishlist request asking for Motion Only AI Notifications. Since it is “in progress”, this is a feature that Wyze is currently working on.
Follow the link and vote at the top to support the request.