I've taken a closer look at that Italian website, and though I can't understand Italian, I can click on links, and they took me to ... wait for it ... Mudcat! Back in 2002, in a thread on Draft Dodging Songs, Jim Krause wrote, "Some verses I once penned to Charlie Poole's You Ain't Talkin' to Me" and there, lo and behold, are the verses Dylan included in his Nobel speech! So either Jim Krause was claiming to have written verses actually due to Poole, or else Dylan got fooled into thinking that Poole had sung the verses that were actually written many years later by Krause (I suppose there are other possibilities, but these seem the most likely).

It would be hilarious if some original lyrics posted to Mudcat made their way, misattributed, into a Nobel Prize speech. The Mudcat thread is here:
http://mudcat.org/thread.cfm?threadid=54088