Hey Elon, as it pertains to rewriting the social security code- the better thing to do would be to use AI to make a COBOL to C++, IL, or some other modern language, transpiler. Then spend a while vetting that. Meanwhile study the old codebase and use AI to verify what all of its major functions do, individually. Then use AI to sum up the business rules of the system. Do a write-up in markdown docs with file by file and function by function explanations. Only when you have an understanding of the system and its requirements, do the transpilation and start to identify things that either don't fit the business rules, or can be improved for clarity. Document (inline code doc and markdown set) everything. Check it all, twice (and two different ways) minimum. Leave both systems running and run the same data in each system in parallel for a period and make sure the new system matches in every way- for months. Then sunset the old system and stop feeding it.
You need old hat COBOL people who knew about the hardware this stuff was written on- back then you did a lot of weird little things in the code to shave off a few operations. It makes the intent of the code much harder to see with that layer of understanding added in.
Big Ballz doesn't know a VAX from a Vaccine.