Unfortunately I don't have this, but it would be great to listen!
And I'm not sure who Diego Assandri/Miralago is, but he could be a relative of the more famous William Assandri (real name Licinio Assandri, other aliases: R.Ciniello and Simvay), or Licinio Assandri himself.
Searching for Diego Assandri on the SIAE database, I got many results/tracks credited to both William and Diego Assandri.
This Hit RTV 13 is credited to R.Ciniello (William Assandri) and to Miralago on the sleeve and labels. On SIAE database, the tracks from this record are credited to William Assandri and Diego Assandri, so I think somebody assumed that Miralago is Diego Assandri and made the entry on Discogs.
The point is we're not sure if Diego is a person in his own right, or if he is William Assandri himself. Also because on SIAE William Assandri is an official author/composer, while Diego Assandri turns out to be "not registered".
Personally, I would bet they're the same person.
Below a pic from SIAE. One of the tracks from Hit RTV 13, "Bongo".