What does that mean exactly? I'm sure there are sections of the charge curve where it is 50% faster, but you need to consider the entire charge curve to get a better sense of the improvement.
The Tesla Model 3's charge times were improved by the combination of battery preconditioning and the faster V3 Supercharger. A charge that used to take 60 minutes can now be done in 40 minutes:
https://electrek.co/2019/03/07/tesla-v3-supercharger-action-...
I'd call that 33% faster charging. So is the Model S and Model X charge time improvement across the entire charge curve or just sections of it?