What conclusion does Roonwit draw from this fact in The Last Battle by C. S. Lewis?

In "The Last Battle" by C.S. Lewis, Roonwit concludes that the fact that a Calormene soldier finds himself in Narnia after his death proves that the Calormene gods were false and the god of Narnia – Aslan – is the true god. This realization leads him to embrace Aslan and serve him faithfully.