Is this an actual physical phenomena or is it just something that has appeared in a computer simulation? That is what it sounds like. It would be a game changer if it were able to be implemented in a simple and inexpensive manner, but that may not happen. Moving from a simulation to reality, (actual hardware), is often the show stopping task. In the interim these chaps have a nice grant to live on while chasing a theoretical "reality".
I haven't seen any of the publications, but I note that in several cases in the above article they said they were able to "do" things, not simulate them. Presumably they were able to make a polariton and observe it. I expect the motion sensing aspect is still theory. It will be interesting to see if anything comes of it.