I've just tried the Italy strategy again and it's still working for me.

Also, I think that in your run you do still satisfy the current victory conditions. You take the two specific regions (Alpes Maritime & Carinthia) and you hold (or your protectorate Piedmont-Sardinia owns) 8/6 regions overall (Alpes Maritime, Cuneo, Torino, Carinthia, Valle d'Aosta, Novara, Lissandria, Liguria).

What do you remember it being? From what I can tell, the victory conditions have been the same since at least 2016 (https://totalwar.fandom.com/wiki/Italy_Campaign_(Napoleon:_Total_War)?oldid=20817).