Parking near Duomo?

Google Maps Street View appears to show paid parking in Piazza Re Manfredi, which is between the castle and the Piazza del Duomo.

There are parking signs with the blue P symbol but I can't make out the small print.

Would this mean that that area is open to the public, that it's not in the ZTL?

I found this map of Trani ZTL but not sure if accurate. Seems to cover only a portion of the Trani centro storico.