What is one reason historians might believe di coppo di stefani buonaiuti’s account of the black death?

One reason why this is believable is because di Coppo Di Stefano Buonaiuti was in Florence at the time when the Black Death hit Florence in 1338. One reason why this passage isn't believable is because he was only two when it happened so might not remember it all

Explanation:

first paragraph (and busy all the night ,with a silence deep and white )

where is the picture of the graph or table?