Yes. State recorders typically divide votes by demographics in raw data, so this data consists of the ratio of red:blue votes for both of those categories of voting.
The map is nonsense. Democrats take advantage of early voting for so many reasons, Republicans prefer in-person election day voting for their own reasons.
There are many more Democrats than Republicans, they just don't vote as much. The map.could easily be labeled: what would happen if every barrier to voting was removed vs what would happen if Republicans were allowed to implement all of the voter suppression tactics they can imagine.
Unfortunately I am not the original creator of this map, however election results and demographics are provided by every state’s Secretary of State and/or elections office, and is accessible via each state’s respective website. For example, this is the website for Ohio.