They faked it, he's re-performing prerendered interactions. I've been doing this sort of interactive installations for nearly 20 years and there's some telltale signs. There's no real reason why you couldn't do it for real though, although it would be much more cost effective now than it was in 2011, especially at that scale.
It's called Projection mapping, the wall has a sensor /or camera tracking that sends that to the PC and the Pc transfer data to the projector for what to display in Real time
Probably this is a concept, not a real installation. There are noticeable shadows from ambient light on white areas and no shadows from projectors. This is not projection nor LED screen (especially LED screen from 2011). Another question - what is the logic of interactive application? It looks like prerecorded movie with clear white walls + CGI.
