Do the official olympic weightlifting rules really not count 1kg increments? Why? Seems like unit and fractional weights should count.
The video shows the European Championships. So it simply wasn't an Olympic competition in that video. He achieved the Olympic record in the Sydney 2000 games with 180 kg, so that number is actually correct. And as you can see on that list every kg counts, so 1 kg increments are possible and achievable.
An Olympic record is only recognized as such if it was achieved in the Olympics, even if it is the world record (or was in this case, since the world record has been beaten in 2007 when Andrei Rybakou lifted 187 kg in the World Championships).