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Based on the fact that it was attached to the bottom of the plate it seems likely that this was an attempt to make metal ptyruges. I wouldn't call it "mail" because it doesn't form an interlinked mesh but it definitely could be a kind of "proto mail". I could also see how further experimentation with this could lead to the 4-in-1 mail mesh that appears a century or so later. The contention would be whether the Etruscans developed it themselves and were the true inventors of mail or whether the Celts were the ones to develop this idea. We'd need to find an Etruscan example of proper mail dating to the 3-4th century to know for sure.