The 1044km claim is from a livestream where the CEO of the company drove the car from Shanghai to Xiamen until there's 3% left in the battery. All this amid a cold wave too.
> The temperature during the test was between -2 °C and 12 °C (28 – 54 °F). The coldest time was at the beginning of the test, as it was early morning in Shanghai. The average cabin temperature was 20 °C (68 °F). The carload was about 190 kg (two adults, lifestream equipment, and other items).