UPDATE TO THE STORY. Author of the video just said (see comments to the video on youtube, in russian) that de-icing procedure was NOT performed. The only thing that was done - ground personnel used a broom with a long handle (no joke) to remove contamination from the very edge of the wing -- that's all. He also said that other aircrafts were undergoing de-icing properly, there was a queue apparently for this procedure. Flight crew of this flight decided to skip it.