Hyundai doesn't really have a foot in the premium market. Can see Apple helping with that.
I know we all associate Apple with "Premium".
But Apple products are not "luxury" products for the most part, in fact they mostly democratized good design and good build quality. They ship products that use "noble" materials and very sophisticated manufacturing process and sell them at a price that's affordable for most middle class peoples.
You look at the iPhone 12 for example, and you have an object that is build with a precision and quality that used to be only for very high end luxury products a little more than a decade ago.
Also, the weird thing about consumer tech is that if you consider Apple to be the "premium" "aspirational" brand, it's one that most people can afford.
I'm a teacher and my phone may very well be the exact same phone used by a lot of movie and sports stars. In fact, even billionaires are probably using a cellphone I could afford if I wanted to.
And this is probably not true of any other object I own. My furniture, my clothes, my glasses, my car, etc. No other object I own I would expect to find in a billionaire house, except my phone, and possibly my computer.
This to say, Premium in tech doesn't have the same meaning as Premium in cars. I think it's more likely that Apple goal is to make an affordable car (by car standards) with the least amount of "compromise" possible.
(Also, they had a phase with the Apple Watch where they tried to be a luxury brand and failed, I don't expect to see them going back to this.)