Anon, the Gaon said that Germany is from amalek way before there was antisemitism there. Rav yosef Chaim zonnenfeld famously avoided greeting kaiser willhelm, even though he was known to be friendly to Jews, because he had the mesorah from the Gaon.
Yes they are Scandinavian… But where did they come from? The gaon bases it on a medrash which says that amalek settled in “Germanya” after sancheriv.
You need to learn history from chazal, not academics. Have a drop of emunas chachamim; if you believe them that a drop of milk can cause a taste particle to form in a stainless steel pot and can be transferred by cooking after you clean it with abrasive scrubbing, then you can believe them for history.
Unless you indeed don’t believe them about things which you don’t understand. In which case we don’t have much to talk about