Well, that answer was sloppy.
The Citizenship Question has four possible answers.
Citizen.
Legal resident, permanent.
Legal Resident, temporary
Illegal alien.
The ONLY answer carrying criminal penalties is the last, illegal alien. Illegal aliens offering any of the three other choices is committing another felony. And ICE should most certainly use the Census tk investigate and penalize illegal aliens perjuring themselves on the census.
Nobody else has any reason to lie on the Censys.
Naturally, only "Citizens" should be counted for apportionment.