Based on the provided text, here’s a confirmation of the points you highlighted:
Continuous presence of human activity in the area since prehistoric times: The text explicitly mentions that the archaeological findings confirm the continuous presence of human activity in the area since prehistoric times.
Hydraulic system reinforces the idea of a structured settlement, linked to the political power of the mythical Ithaca: The text states that archaeologists believe the hydraulic system supports the idea of a structured settlement connected to the political power of mythical Ithaca.