Re: The date seems very optimistic
Given that neither Dyson nor Dyson have any expertise or even any public experience of any of the components or regulatory requirements of an EV.
What, like Tesla a few short years back? And I'd not expect Dyson to build them - plenty of competent contract car builders around, or spare capacity at major makers.
There are a few surplus car plants they could buy, lock stock and barrel, but I don't think that would be the plan. Good luck to him.