I did not follow many other stages of the hike when I did my cycletour around southern Southamerica. So I do not know how many of them are signposted for cycling and hiking. This stage was at least 6 years ago. As I remember, there was a sign at the start of this stage indicating that this stage is for bicycles and hikers. This was the hiking relation you deleted: https://www.openstreetmap.org/relation/8653146/history
The official website mentions this stage as well as possible by bicycle. But as I just saw when I went to the website, it recommends it only for the direction towards San Martin. https://patagonia.gob.ar/senderos/huella-andina/