When a large sedan claims over 1,000 km range, what should we believe?

For the same 1,008 km range, what's the difference in technical difficulty between NEDC standards and CLTC standards? BYD's Han core parameters released this time—3.8 seconds to hit 100 km/h for the AWD version, and 1,008 km pure electric range—have caused a stir in both the automotive circle and developer communities. As an AI tool developer who deals with engineering metrics every day, my first reaction wasn't excitement, but wanting to dissect this number to see exactly how it was stacked up.