This event page is still up, and I see there is now a blurb that says: "Basta con i fake di Adele, Coldplay, i Gunz.
Sostenete gli eventi veri e di qualità." Google translates that as: "Enough with the fake Adele, Coldplay, the Gunz. Support the real events and quality."
Presumably 'the Gunz' are Gun n' Roses, who did their own reunion thing last year?
My current theory is that this will eventually disappear in a puff of smoke, everyone will presume it was a hoax...then 15 years later we'll find out they actually got close to doing it.