5000mAh battery I believe has been confirmed by actual photos of the battery.
Mavic 2 batteries are 3850mAh. Nothing out of the ordinary there really. 5000mAh 4S LiPos are common in the RC car world as well, and they result in roughly 30-40minute run times in those applications as well.
30KM range is likely the advertised 15KM range X2 (out & back), which it can probably do with a 40+ minute battery. That being said I did see the spec sheet mentioned Occusync 3+ (plus) so maybe there is a surprise there. I doubt it is 30KM range though, as it has to get back.
The maximum service ceiling is 6000m, that is exactly the same as the
Mavic 2 and nothing special really. It doesn't mean you can fly from sea level to 6000m necessarily, it means if you take off from the side of a mountain that is already at 5000m, the drone will still be able to fly in some capacity.
That particular quote reads like a bad translation, so there might be a language barrier there as well.
I really like the looks of it personally - it keeps the classic Mavic design while still looking like something modern and different. I think the rear-mounted batteries are a big part of that and is a better way to go about it in general.