Consider that they described the development process as taking Siri down to bare metal and rebuilding on a new architecture. I don’t think our previous Siri experience will be particularly relevant.
They decided to use the Siri branding, so I am going to do as they tell me an associate it with my prior Siri experience. That's a brands sole purpose, to give a buyer an indication of a product before they buy it. (Or in my case, given my experience with the brand, not buy it).