The Poet writes a note to be handed off to B'Elanna. Although her universal translator is what makes the alien's language understandable, there is no reason to believe that she should be capable of reading their written language.
B'Elanna tells Kelis to bring her a metal sheet that is "three parts tin to five parts bronze, one side coated with gold." Classical bronze is, by definition, an alloy of 90% copper and 10% tin (sometimes with trace amounts of other metals or nonmetals, such as aluminum, manganese, nickel, zinc, arsenic, phosphorus or silicon); modern bronze is typically 88% copper and 12% tin. B'Elanna's request is both redundant (because bronze is copper and tin) and nonsensical (because she is asking for bronze with extra tin in the mixture when tin should already be in the metal mix).
The entire plot is based on the fact that Kelis the Poet "saw a light burn across the sky, and heard a terrible sound", and thus found the Delta Flyer and B'Elanna. It is very unlikely that such a phenomena would be witnessed by only one individual.