Says who? It most definitely is "Divinely-inspired Scripture" according to the Orthodox.
Sirach may be in the Deuterocanonical (Second) Canon, AKA Apocryphal books, but it has NEVER been accepted as God-breathed Scripture by those who even Paul said were given the Oracles of God - the Jews. Why did they get appended to the books of the Old Testament as if they WERE divinely revealed Scripture when even Jerome and others placed them separately between the two testaments? I guess "Protestants" must observe a higher standard on what is considered the Word of God than the EO and RC do.