Who do you think writes code for the T2, if not programmers? You're imagining that people who are employed for Apple are special, but they of course are just ordinary programmers.
Your point about SSD controllers is embarrassingly incorrect; there exist many hackers of SSD controllers, including OpenSSD [0], an entire open-source community of folks working on the problem.
Please stop apologizing for Apple's walled gardens. They intentionally limit access to hardware, even after it's legally sold and belongs to the new owner.
Edit: Downvoters, provide evidence or knock it off. Nobody's interested in Apple apologia this morning.
Well, yes, I don't know if you've read the rest of the thread, but it's quite apologetic. For example, the parent claims that nobody outside of academic research should actually want/need/desire to write code for the T2, but this is clearly bullshit meant to apologize for Apple's sealing off of the T2 from user access.
Maybe we should stop paying a fashion company to sell us chips that we aren't allowed to touch.
You can't normally run code on the T2 but I don't think that has much use outside of research. You can't run code on an SSD controller either.