1000 years? Is there evidence about these Veneti being that much more advanced in naval technology?
No, but the destruction of the Veneti, along with the Mediterranean fleets of the Phoenicians, Greeks, Illyrians, Cilicians, etc. wiped out the need for naval advancement for several hundred years and for all practical purposes. Had the Romans not completely dominated the waters of western Europe, and rivalries continued to develop (on a scale forcing necessity), it surely would've inspired continued changes.