Context?

Without knowing how this compares to other states, which areas have higher counts of rental properties, how other states compare, and things like average or percentage of: ages, incomes, ethnicities, and probably party affiliation, this doesn't tell us much by itself.

I am encouraged that it is given as a percentage of the voting population instead of a numeric count (XKCD's pet peeve #208), but it still looks a lot like a population map. I had to find a straight population map to compare where it differs, and as a quick visual trend they are similar. From https://www.someka.net/blog/ohio-zip-code-map/ :

Overlap that with an income map (from https://proximityone.com/srdmi/ohdmi.htm):

With only a visual examination, I still have little idea of what the map says about voter purging. I can't tell if old people are getting purged as they die, if college students are getting purged as they fail to change from their school address, or if a particular party is getting purged just to sway elections.