that's fine. it's something different than affirming a one person one vote principle. but you have to count population numbers some way and the census data is one way to do so that is consistent.
maybe i am missing something about the naysayer position. your initial post is all i know about it. sounds like the methodology excludes illegals (legally-speaking, i believe illegals are non-residents) but includes everyone else. in my view, counting illegal immigrants in figuring the voting population would be a mistake so long as the data are available. can't see a reason to support their inclusion.
i agree. it's not obvious that there is any material issue with the traditional system. at least insofar as giving people access to the voting booth.