The map specifically says "share of population" in the Oblast.Come on, that's obviously completely made-up bullshit. That said, I've just pissed 97.2% of the volume of urine that I did in 2007 after 12 bottles of Peroni, so maybe they're onto something.
Mykholyv and Kharkyv are definitely correct. Zap is probably not far off the mark either if they are going by population centers and not land. If you control the northern part of the Oblast where Zap City is, you control a majority of the population in the Oblast. They do need to update Kherson though since the Ukrainians reestablishing control of the city, means they now control most inhabitants in the Oblast.