Let's say you are doing SEO for latvia, latvian keywords, latvian money site, etc.
You buy english domain that you want to use as a PBN. It's not expired, it's indexed on google, but only has one front page (which basically says "this domain is for sale").
But the point is, after you buy it, should you change it's language to latvian? Or keep it english? All backlinks are in english.
If you make it latvian, then you can create latvian articles, maybe even use exact match latvian anchor….