First of all, there were no Scots in Scotland in 6000 BC. In fact there was no Scotland yet either.
Second, it would have been more to the point to say "early farmers in (what today is Scotland) didn't fertilize their crops." Because saying "they didn't fertilize with manure" implies they did fertilize with something, it just wasn't manure.
It bears mention that the source article (as opposed to the parasite article linked to in the OP) avoided both those mistakes.
There’s no way to know what the lands were called, if anything, so, yes, it makes perfect sense to call it by what it is now.
Second, quit complaining to me about headlines that I don’t write, and just in general try to post anything in the GGG topics that isn’t a complaint.
https://soils.environment.gov.scot/soils-in-scotland/guide-to-soil-types/
Maybe they didn’t even need fertilizer.