blackwater wrote:

Systems created in the 1970s like Social Security would not have used SQL. Instead they might have used something like CODASYL, IMS/360, DL/1, GIRLS (later renamed to "Pick"), etc. Pretty much all of these ran on mainframes, as was the style at the time.

For example, the US tax system, Individiual Master File, is written in assembly language with a dash of COBOL for seasoning. It still does everyone's taxes to this day.

I don't know what computer system Musk referring to in his tweet. Perhaps the Death Master File? In any case, you incorrecting him about a system which he has access to and you don't is one of the most Reddit things I've read in the last 6 months.