Tesla has shipped their custom SoC in every new car since April 2019.
In particular, you assert that:
1 - phone is more complex than a car
2 - if phones is more complex than a car, then the organisation that produced it can produce a car.
You have provided nothing to back them up. I am in particular disagreeing with the second one.
Making the leap from "Apple makes many complex hardware parts" to they can make a car is a smaller leap than the opposite - Tesla literally didn't exist and made a car, so to assert Apple somehow couldn't is... weird.
Things Apple builds already that are in cars: custom glass, speakers, lights, complex aluminum frames, computers, cameras, knobs/dials, batteries, screens, wheels, fans, materials from leather to rubber to plastic, memory foam...
Cars use many more off the shelf parts, they have far easier supply chains to tap into.
Designing and building the CPU, GPU, camera systems, neural chip/software, touchscreen, FaceID, etc. All of these components require way more competence to build than any single part of an electric car using an off the shelf computer.
Cars have more parts, but they are dramatically bigger, less intensely complex, less intensely integrated. Just the CPU alone of a phone puts an entire electric engine to shame in terms of difficulty of engineering.
So it’s an interesting comparison. But I’d put money on Apple making a great car before Tesla made a great computer.