So, at maximum power 109hp, the EV motor is pulling circa 470 amps from the battery, that’s more than conventional starter motor current

However, in those conditions, the vast majority of those Amps will be drawn from the engine/generator, with only any shortfall in requirements being made up by the battery.
I have to say, I do on occasion make use of those Amps, EG up slip roads to join main roads etc.