Indeed, you are both correct that there is a de facto crossing (there is even a gap in the hedge), but that it is signed as illegal. Therefore, I added `crossing=no` and `access=no` on the path as suggested in https://wiki.openstreetmap.org/wiki/Tag:access%3Dno 

I did the same with the two crossings just east from here.

As for the height limit, Street Complete asks for it as apparently:

> maxheight=* - if a max height is signed (sometimes present when the railway is electrified via wires situated overhead, above the tracks)

This is irrelevant in this case.