3 ideas
Frame the past around a piece of geography, 'the peninsula', rather than a nation. With no nation at either end of the story, national identity cannot be read back into prehistory, and the people who lived there appear as inhabitants of a place rather than early members of a people.
Much of what a small country treats as its own essence arrived through contact with the wider European and human story: migrations, trade, religions, languages, writing and ideas passing through. Treating the national past as a sealed, self-generated tradition misreads it. The accurate account keeps putting the local story back into those larger currents.
Delivering millennia of history as one fast, joking monologue denies the past the reverence that national myth depends on. The speed flattens heroes and founding moments to the same level as everything else, and the jokes expose how contingent and absurd they were. Refusing to be solemn becomes a way of telling the truth about the past.