> There's no proof of these cars even existing

Here's a Nio covering 891.4 km (554 miles) on a single charge with its 150 kWh battery pack:

https://insideevs.com/news/732567/nio-chinese-ev-range-test/

Here's a Nio doing a battery swap in 6 minutes:

https://www.youtube.com/watch?v=VmWL1hZQmD0