You probably mean antirez porting Flux to c. There were not too many shortcomings in his breakdown; his biggest one as I saw was that his knowledge and experience building large c programs really was a requirement. But given one of these experts, you don't see how that person and claude code just replaces a team. The less capable people on the team cannot do what he does so before they were just entering code and getting corrected in reviews or asking for help. Now the AI can do that, but on 10 projects in parallel. In a weekend you wont have time for that but not everything has to be done in a weekend.