Exactly, the contradictory licensing makes this marvelous set of vehicles suited only for personal and proprietary use. A free software project would be tainted.
This car pack by Cosmo recently fixed the very same issue.
Viewing post in FREE – Low Poly Car Starter Pack comments
Awesome! Then they would be perfect for OG Tatt. 👍️
But it doesn't so much require a change in license, since it's already marked CC0. Rather the third point under Usage Terms would simply have to be removed, because it contradicts the licensing, whichever free culture license you choose.
You could of course make it a "really rather not", as you did with the request for attribution.