I think this is from CITA 2003 [Congreso Internacional de Tango Argentino] - the CITA dvd with some of the best performances ever, in my view. The audio is de-synched a bit. In the original (on the dvd), their musicality is dead on.
These are two dancers with no pretense whatsoever, and it shows in their dance.
Also, please note that this is "NOT" nuevo tango.