This is far worse than going behind the crates opposite the entrance. It only took you 10 tries to get up there, and you're considerably more exposed to enemy fire. Not to mention the ease with which you might accidentally fall from that perch and waste another 90 seconds jumping back up.
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As said in the video. You can't fall. There are invisible walls holding you up. I have since mastered this pipe trick and can get up there my first try each time. I was thinking about remaking the video for a better indepth guide
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Gotcha. Had to listen on mute (at work). Still seems that you're more vulnerable to adds up there, though.