It doesn’t look like any Roman sword I’ve seen. It appears to be bronze, Romans made their swords out of iron. I suppose it could be ceremonial or something, but then it could be fairly modern. Or just a fake.
They must have read your post because now the article says it’s a ceremonial sword.
No expert here but the dude on the hilt/that ‘is’ the hilt sure looks Greek/Roman in style. And the Romans liked short swords so I suppose it’s possible.
As to the actual arrival circumstance, I’d ‘guess’ loot from a Viking haul that arrived via said Vikings.