I solved the problem regarding stats: during my manual backup/reinstall to attempt to fix races, there was a fourth folder that had to be backed up which I did not; but it was in the trash thankfully for restoration. Three folders wasn't enough.
There was an undocumented patch today for Divinity OS2, along with a documented update to the Divinity Engine editor.
Neither fixed the big problem. Custom races still won't load, including the fresh templates from the wiki.
EDIT: I noticed an error in the latest version of the editor that stated "XML error" with my race file. I deleted it, remade it from the wiki template, and now, my race and the wiki template races appear correctly.
I have a suspicion that it was unhappy to find an XML error in any race folder, and thus wouldn't read the remaining race files. However, I find it odd that in a fresh mod, the custom races would still not load. In any case, resolved!