That's not true for SSNs. It's not true in that it is false. My statement that it is false is, in point of fact, true, and therefore not up for debate.
The government even acknowledges this:
https://www.ssa.gov/OP_Home/handbook/handbook.14/handbook-14...
> 1401.7 Can a person have more than one SSN?
> Most persons have only one SSN. In certain limited situations, SSA can assign you a new number. If you receive a new SSN, you should use the new number. However, your old and new number will remain linked in our records to ensure that your earnings are credited properly. This could affect your benefits.
Maybe there are countries where it is the case that nobody ever gets multiple National IDs. Maybe there are countries without fraud and where everyone can and will update their records when the government does. Maybe there is a veritable Utopia on Earth, a Cockaigne of validated data and reasonable deadlines.