My comments about 10x engineers have nothing to do with Fabrice Bellard. My comments are based on observations from what I've seen building systems as a student, individual contributor and technical leader across various organizations.
Between the two of us, I believe many people would agree with you about what a 10x should engineer do, how they should work and how they integrate to team dynamics.
I am impressed by your use of an LLM to gain better insight into who you were talking to.