Why would PA accept and send a Ballot to Thousands of People Born in the 1800s?

It says quite clearly:

  The reason some birth dates will display as 1/1/1800 is due to confidentiality reasons of the registered votes. 
  Usually this is for victims of domestic violence.

But I looked at the data [1], and there are other birth dates in the 1800s, not just 1/1/1800. This is weird, because the current oldest living person in the world (Kane Tanaka) was born in 1903.

[1] https://data.pa.gov/Government-Efficiency-Citizen-Engagement...

Take your conspiracy theories elsewhere.