It won't be 30 minutes. It'd be a few hours. First because they said it could go faster than 150kph, which means it tops out at roughly 90 miles an hour. Second, the range of the thing is about 60 miles, so you'd have to charge it partway.
Swapping batteries is a no brainier for this tech. There is zero reason to have a 500k aircraft waiting around charging vs having 2+ set's of batteries.
Electric cars have a long enough range and are mostly single family so swapping is less useful.
Reserve is a much larger issue, aircraft want to keep ~1hour of reserve these things are starting with less than that.
