I don't think you can just scale everything linearly by kWh. Total manufacturing emissions need to include all other car components, and there's literally a ton

I don't think you can just scale everything linearly by kWh. Total manufacturing emissions need to include all other car components, and there's literally a ton of them, plus overheads of running manufacturing plants, transport, etc. Plus they're claiming a significant mass reduction, which if true, should mean that the battery doesn't use as much raw material as a simple scaling of older tech would suggest.