AI.
All the men in the background have the same face as the male dancer.
ETA: As predicted by Frank Herbert in his Dune novels. 
Iād say CGI perhaps, but not real for sure.
Well ācomputer generatedā in the sense that āAi generatedā is also computer generated.
As well as the real giveaway of every male being a clone the movement and body positions frequently look very unnatural.
Getting harder to spot these things when done well though.
The head of the male dancer is clearly āattachedā by cyber glue. There are moments when the head and body are not quite in synch. The womanās face changes, too. The face at the start is different to the face once they start jiving about.
The difference between CGI and AI is (simplistically) that CGI is content made directly by a human using computer software, whereas AI is content generated by an artificial intelligence program that has been given prompts by a human (such as āmake me a video of some ballroom dancersā).
In CGI each dancer would have been generated and had their movements set by a human operator manipulating the software controls themselves.
AI is insidious because it makes it possible for non-specialists to generate visual material thus opening the door to ādeepfakesā.
At the moment it is still in its infancy and so not too hard to spot - but once it becomes impossible to tell real from fake we are all in trouble