Well , given that we don't know where it actually *is* , there's a remote chance that if it does indeed exist it may be in a feasible flight path.
The research shows its likely presence from the grouping of a number of KBE orbits. It does not tell us where we can find it, other than a rather broad band of possible orbits depending on the actual mass. Where in that orbit the planet is at this point in time the research can't tell us. The planet itself could be all the way on the other side of the Sun, or straight on an extended flight path for New Horizons. We don't know until we find the thing..