I guess it will be the same as the Firenze Rocks "VIP Party" Package in the last years. At least the description matches it almost by word.
Did this in Firenze last year for Muse and it was as you already guessed: An additional PIT in the "normal" PIT. It was about a quarter of the "normal" PIT, covering the full right half of the stage and about half the "normal" PIT back. It had a total separate entrance to get there without queuing from the VIP "open bar" area although that was a 3 - 5min walk. It was full (at least for the headliner) but still a little less crowded then the normal PIT. For the bands up to the headliner you could get very close to the rail or have quite some space to dance. Food was OK/good, the open bar did mostly have Aperol and Prosecco, no beer + was almost empty / had long lines when the co-head finished.
I did it mostly because the PIT tickets where sold out when we decided to go but I actually liked the front PIT very much and may do it again for a good band.
