You data does have a “Displacement” vector data array. However, all the displacements appear to be in the plane of the data:
The Warp By Vector filter works fine on your data, it just produces a shift of the points in the negative x direction:
Note that there is also a Warp By Scalar filter if your data has only a single component (i.e., it is scalar data). It warps along a direction you define by a magnitude proportional to the scalar component.