as it should. The workers who did the work were from Hitachi-GE Nuclear Energy and from Hitachi Plant Engineering and/or their subcontractors, judging by the photographs.
In the video also released by TEPCO, the workers on the ground were blurred, supposedly to protect privacy, and half the banner was hidden as the workers go back and forth in front of the removed lid.
But in the photographs, the only modifications TEPCO did was to blur the names of the workers on their backs. No need to blur the faces of the workers in the video anyway, because they all wore full face masks.
The work required 36 workers in two groups (18 each). The workers were exposed to maximum 0.39 millisievert for the work that took 15 minutes on August 10, according to the information TEPCO released on August 10, 2012.
(Click on the photo to enlarge.)