That’s what the lemon lawsuits mentioned in TFA are about. Without spare parts, entire sales get nullified and the refunded cars can’t be resold as new.
If anything, as a smaller company you should be able to offer better customer service (‘do things that can’t scale’). I.E. at fiskers scale you could do this with a couple of shelving units and one person looking after the ‘spares’ department who also communicates directly to the customer.
The fact that they aren’t all over this does show either a lack of detail, a lack of cash, a lack of resource, or a combination of all three.
Fisker wanted to sell hundreds of thousands of cars.
If you want to sell a car, that is one of the things you, as a manufacturer, just have to do in order to get people to trust you.
A manufacturer who's cars can not be repaired isn't worth anyone's money. Also for every car there are a few specific parts which experience high wear and absolutely should be ordered in quantities to keep up with demand for repairs.
That's why the article calls this "standard industry practice", not sure why you didn't get that.