Is this cable suitable for DMX wiring?
DMX needs a cable with 110 Ohms impedance, and it should be twisted. I was not able to see the impedance of your proposed cable in the datasheet, but I doubt that it is 110 Ohms. 

Another thing is that this cable has only 2 conductors, that means the shield/screen has to be used as the GND connector. This is not good in terms of electromagnetic compatibility. 

So it all depends on the performance criteria that you need: I would expect the DMX bus to work with this cable, but as there are a lot of signal reflections because of the improper impedance, I would definitely not recommend using this in a professional setup.