It was never a true production car - none of the cars GM leased were registerable because they did not have a finalized production design submitted to safety or (ironically) EPA standards.
Technically GM did lobby against hydrogen fuel cell tech at the same time because the ZEV mandate specifically also included hydrogen as a potential solution. But no one is accusing GM of also killing the hydrogen car just because it made it less far along the development process.
I know it's the real controversial opinion - but nobody was wrong. The experience of CARB more or less proved that a successful EV was not immediately available. But mass hybridization probably resulted in more measurable emissions savings than the original 10% ZEV goal ever would have.