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Given the context of the Declaration (i.e. The First Scottish War of Independence) it sounds to me like propaganda trying to claim an ancient and separate lineage for the Scots.

Mind you the Declaration is a great document - proclaiming Scottish freedom and saying that while Robert the Bruce is a cool guy if he doesn't turn out to be a good king then he'll be sacked and another one found from somewhere. Which is a fairly novel idea for kings.

The proto-indo-European migration is thought to have been a cultural and linguistic migration, not a mass physical migration or a conquest.

Source on that? IE spread from the Dnieper River area to Western Europe and Western China in a rather short amount of time. Clearly there was a lot of migration from the Urheimat.

Sort of. The languages did. But there were people in Scotland before any indo Europeans got there.

And people before those people, most likely!

That is was written in the 14th century makes it very suspect.