No, the data is just extremely incomplete. Just taking a very quick glance, without comparing with other maps, I can tell you're missing railway stations along several railway lines in southern Italy, for instance to the Gargano peninsula, along the coast west of Taranto and in various places in Sicily (Pozzallo, Licata, Termini Imerese etc.). This is just off the top of my head and sticking to railways; I'm sure there's thousands of bus stops missing, too, but I don't know by heart where bus stops are.