We don't actually know what Resist Silence +1 does, and Ballista is a pretty bad place to test such things because (iirc) they superpower all resist stats in there.

The only "testing" I've really done with Resist stuff was with Atma of the Impaler/Harvester killing Hecteyes in Tahrongi. They cast Bind, Blind, and Sleep frequently, and I had Resist: Major for all three. It came out to a 50% "Resist" rate (N<100, all cases pooled), but that doesn't really tell us anything about how the trait works.

Regardless, I don't think that earring is particularly ambiguous. It's not giving you +5 to all status resists. It's giving you a 5% chance of resisting any status.