It's obvious that those that write the tools/infrastructure are less visible than those that create the end product.
I don't know a single name behind the construction of the AI tensor core in Nvidia's chips but it is effectively what runs all of AI.
I think Fabrice is actually quite noticeable. His name kept on coming up again and again in the past. He is definitely not incognito as such, even if he may not be that interest in hyping up his own name either.
They can't hear you, they're on a yacht
I think that undersells Bellard. The engineers that made NVidia’s chips made a trade: they give their achievements and potential public recognition to their employer in return for generous compensation. Bellard’s work is overwhelmingly free and open source.