Unable to answer "How many steps are here?" – Chemin Joseph-Antoine Durbec (Steps) – https://osm.org/way/44828667 via StreetComplete 63.1:

It looks abandoned. It for sure is not accessible for the public. The footpath next to it is fine. But no accessible stairs here. 

Attached photo(s):
https://streetcomplete.app/p/341612.jpg
https://streetcomplete.app/p/341613.jpg