Where did all the "new" voters come from?

[SmartVoter22]

22. The 'actual model voter' will be known in time

The actual model voter for this election will be known, but not until the entire vote record is known, that the census data ( from 2010) is applied and then compared to the 2020 Census results which is next year.

Only then will the analysts be able to create a voter model that gives us that 'perfect average voter's '...
...Age
...Gender
...Urban vs Rural
...Education
...other misc demographic info

Who that voter is, only helps campaigns develop marketing plans.
What is the issue that new voter model thinks is most important.