There’s absolutely no doubt the Goths came from Sweden. There are just too many proofs that this is the case including place names in Sweden, historical records from Scandinavia and the Goths themselves and now genetics.I agree with yourself, their homeland was from modern gdansk to the Nogat river
but swedish authors, like the book
The well spring of the Goths place them in Scania and Gotland before their "polish migration "
OskarOzkar said:The way I interpret it is that the Goths spoke the old tongue while the later vikings spoke the Danish tongue influenced from celtic conquered peoples. This fits current linguistics. Gutish - the tongue spoken by people of the island of Gotland show strong similarities with Gothic.