Nowadays it is a common thing to have ghost producer. Also it is not something new in entertainment industry.
When for the first time I heard "Tanzen" from "Tecno Fes vol. 1" I was pretty sure that was collaboration with Mauro Picotto. To my suprise Picotto wasn't credited as a writer or producer. When Mauro Picotto released "Old But Gold" I wasn't even suprise.
So, absence of Daniele Mondelle in credits it's not suprising for me at all, but it is a little shameful and disrespectful especially when Gigi was using his Mindsjourney moniker into the credits to receive the royalty from tracks that wasn't even his, for e.g.: Federico Romanzi's "Modem" or Mr. Dendo's "Il Trip Del Vagabondo". Both tracks was later released without Gigi as a composer or producer.