Agreed. It doesn’t rewrite anything. That fact that it is in Latin suggests, not that the Germanic tribes were getting into Christianity, but someone else was a Christian and was among them. Unless I’m wrong the the Germanic tribes north of the alps resisted assimilating the Roman Latin language into their culture.
If the assumption is that wearer came from afar.
Latin was how scripture, sacred documents et al were shared in early church to prevent error.
We would need to know more about the wearer. Knowing if Latin was his first language or if he was local would tell much.
If he was local, he was likely evangelized in place via Latin scripture by the early church.