Yes, it's the same, and it was previously mapped by me more to the north: https://pewu.github.io/osm-history/#/node/10906078478 . When ks1v relocated it, as well as adding the building and the retaining wall, I did not argue, thinking that he knows better... Apparently not.

Yes, if you just climb over those metal beams (it's not really difficult), you can do down the stairs. I did that 2 or 3 times, and judging by the  more or less beaten path, I'm not the only one.