Counting illegals on a poorly defined framework of which is largely self attestation?

We also know that this premise is simply wrong, Census is statistical survey, no party in the world is legally allowed to inspect the contents of the individual form via Title 13.

Counting illegals is not possible under the Census currently or in any point in the future most likely

https://www.law.cornell.edu/uscode/text/13/9

https://www.census.gov/topics/population/foreign-born/about/...