For those interested, Juan's comments
This comment was posted below the video.
QUOTE:
jdorenbecher
Former pilot and I was on that flight on that day. Shortly after TO the pilot slightly retarded the engines. I noticed it but it was subtle. Then we started sinking. The aircraft did not nose over into a dive. It felt like we were hit with a downdraft. Many screamed and the crew increased thrust and recovered and climbed up to FL39 and smooth air. I normally don't get too bothered by turbulence but I knew we were very close to the water having only been in the air for slightly more than a minute.