There is 0 chance he hasn't or isn't willing to take Viagra or Cialis. There are such widely available and mild drugs.
It's possible he has even tried penile injections, something like trimix (stronger cialis/viagra).
Taking them won't give everyone a rock hard erection.
And his issue isn't that he can't get an erection, it's that he doesn't get rock hard. This is much more difficult to fix.
The possibilities are:
1.Fat injections for girth (his girth is crazy, but his dick isn't the longest compared to other pornstars), which means he physically can't get rock hard because the outer layer of his dick is just fat.
2. He pumps his dick to get edema, meaning he can't get rock hard because the outer layer has a bunch of fluid retention. A handful of the big black male talent obviously do this, it's so blatant and so off putting. I wonder if it's preferred because they can give the viewer the illusion of a big dick, while also making it soft so it's easier to handle for the female star, easily allowing proper sex.
3. Some sort of surgical procedure (I doubt this).
4. Lastly, it's possible he has done nothing and just can't for whatever reason can't get rock hard.