I don't live there, but I vacation in that exact
area multiple times per year, and I am about 99% sure there is no access between those houses. The two houses next to each other where you feel may be an access are Chelsea, with Sun, and Raindance, with Surf or Sound.
Having said that, I wouldn't be surprised if people walk along Raindance's fence, and use private access. We had multiple families walking through the property we rented last year and we don't even stay oceanfront. The photo of people walking.....they are probably going to turn right and walk to the access, or use private property.
As for driving to Rodanthe for parking, there are actually 5-6 spaces right there where the public access is. If you see the little traffic island in the first aerial I posted you can see a larger blacktop area that is parking spaces, with sidewalk out to the wooden boardwalk.