It's steep, but passable, as the weather is very dry nowadays, it's mostly bare ground.
If you come from the top, from Bérc utca it's easy to miss, but as I know the area well, I knew what to look for.

But even if it was not visible, there are better tags  than deletion, it's hard to find old changesets where things were only deleted. 

E.g. you could just add trail_visibility=horrible

or change it to:

* abandoned:highway=path
* obstacle=vegetation