Even after nimdod's explanation i'm not convinced, it looks too short.
look at the other photo
the instructor is almost level headed with the wall and you can clearly see the floor in front of the wall - the sand doesn't add any noticable hight and the instructor seem avarage hight considering the scale and other soldiers.
I'm 1.85 and it was the only thing I didn't have an easy time passing in the bahad 1 bohan maslul (which is the last one I did and remember vividly). It seemed in the 2 meters range as well, as it was definitely taller then my head.
Then they're just a bunch of girly-boy Nahal wannabes. When I was their age, we climbed that wall with two pakalim (M"K 77 and margamah 52), 2 Galils and did it both ways uphill in the snow, while laughing at Golani.