Writing a programming language is not as difficult as you may think, once you understand how it works.
Serious?
In the end a language has to be high-level enough to for humans to easily learn and rich enough so they don't have to turn every bit on or off in the the trillions needed to make the machine function.
While he was in college this man took what others had pioneered, improved it and got noticed by Apple in the process. Doing what typically happens at university levels, they funded his future and added to their (Apple's) bucket of assets.
Basically what I am saying is start from scratch, no pre-code or history, just ones and zeros, and come up with a new high-level language that works with a modern piece of computer hardware. ]Write to all the ROMS, switches, video locations, and more...
How long and how many man hours has it taken since the first tube computer to get to the current programming environment?
It may seem simple to you, but it's not just huge it's beyond real comprehension.
But that is all a digression to the the thread's subject.
It will be interesting to see what an electric car company does with a young talented compiler designer and refiner.