Looks like this is the site they referenced, but the data are actually different:

https://worldpopulationreview.com/state-rankings/number-of-registered-voters-by-state

Not sure what your browser is, but I had a similar thing happen. I just refreshed the page and then it loaded correctly.

It’s really not a hard problem and you’ve already identified the answer, more or less. What exactly is not figured out? The real barrier is getting the thing adopted