Stock photo-reason for rejection

The description is not vague. You can buy that car. Price on request:

I'm sure with a little research, we could find even a more similar car.

There are also quality issues with your picture.

Anything that is created by a human can theoretically be their Intellectual Property and be protected by IP laws.  I commonly see the phrase "recognizable property" used when talking about what needs a property release for Stock Photos.

A while back and if my memory is right, Apple and Samsung had a go in court about whether rounded corners on a phone could be considered IP or not.

Sometimes simply removing logos is enough be accepted and appear generic, other times the object is still easily recognized.  This illustration reminds me of a Lamborghini for instance, even modified some and without badging.

Defending a lawsuit is very expensive, so even if Adobe were to be in the clear it still might cost them several hundred thousand dollars.  Along with @Jill_C , I think Adobe errs on the side of caution.

Good luck with future submissions!

The distinctive shape of some autos is protected by IP.

regarding your questions on generative AI, here's the Adobe help page:

https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html

I think that since you created the base image with AI tools you need to check the box, even though you subsequently modified the asset. I think one of the reasons for that check box is to allow Buyers to select or exclude AI assets when they're querying the database.