No. The barges of hardcore fill and tractors spreading it only improved to just a little South of Las Terrazas then stopped.
Currently, with the recent rains its foolish to try and go North of YWAM (The old Journeys End property). On the map above that would be about Punta Arena.
I saw two abandoned golf carts in the road this morning hard to imagine people renting carts to folks wanting to go North but they do!

White Sands Dive Shop
https://whitesandsdiveshop.com/