This is BS... yes, Di Carlo made some pre-versions of some tracks like Pioggia E Sole, Risveglio etc., which we can hear on Youtube... but the versions released by Gigi are on an other level of production.
I don't think that Di Carlo alone could make these Gigi tracks in the way, in which we know them. His own tracks sound more simple and rough...
What's the purpose of this video, I don't get it? His name was mentioned in the credits, so it's not a secret, that he worked with him on some tracks.