Yes. He could do solid work when you narrowly define it but he probably sank the productivity and morale of people he was working with.

Individual performance doesn’t matter. Team performance does. All of this work to find 10x engineers is meaningless if they can’t raise the output of the team itself. People can make their teams better (sometimes with elite communication skills instead of technical), but we should be focusing more on building 10x teams, not trying to find unicorns.