As a software engineer I can assure you that this is absolute bullshit
twitter.comPeople (fraudulently and/or accidentally) use multiple social security numbers.
https://www.nbcnews.com/technolog/odds-someone-else-has-your...
As people have pointed out it depends on the details. Maybe SSN is not the primary key and it's something else like name + DOB. It still requires more details to prove that it's being used maliciously but there's no reason to think it's completely b.s.
The reason to think it's BS is that the schema of one table, without the whole process around, offers nothing to base such a conclusion on. His target audience is people who neither know or care.
https://bsky.app/profile/chadloder.bsky.social/post/3lhrhwmr...
> Social Security systems represent data as a 1NF time-series of change entries: life event changes, legal name changes, address changes, and benefits formula and even statutory interpretation changes.
> Read them forward like logs and calculate rollups which are ALSO versioned.
The problem here is that Musk's statement is meaningless drivel. That suits him fine because his purpose is not to convey information but to create an impression. The impression he wants to create is that the system is fundamentally broken and that only he, the great and wonderful Elon, can fix it. It does not matter for his purposes whether the statement is true or not. In fact, it suits his purposes best if, as in this case, the statement is neither true nor false because it is essentially meaningless.