Probably there was not an official "Congress camera effort" but maybe some of the more important attendees may have been presented with this more expensive camera, or it was for sale at the Congress for those who could afford it.
I'm sure that the different Zavods were always happy to be represented and their products shown / offered to the Party bosses and representatives! Best way to get future funding! Look at what Khruschev's love for the early FS-2 did for the life and production of the Fotosniper models! Probably a lesson not lost on the rest of the camera industry.