For ZRH your lounge is the Hangar lounge in A concourse between the higher A piers.
For CAI and LAX your lounge is the Piazza di Spagna at the beginning of E11-24 pier.
In theory you might be able to use Piazza di Spagna before ZRH, if you exit Schengen and then enter it again. But it's a useless detour with a risk of being turned away anyway. The info on ITA site is a mistake.