A much cheaper solution
A good deal of the information they need on the citizenry is available from Facebook, Google and Amazon. There is also Equifax that not only gathers all financial info, but also SSN and employment salaries on all adults still breathing or dead. If these data mining entities refuse to send the data to census bureau, hack them. There is an agency for that.
If all else fails, the dark web has all the info they need for a small fee.