Lateral corticospinal tract and termination
The answer ends up being on the next page when discussing the ventral corticospinal tract.


  Many ventral corticospinal tract axons have branches that decussate in
  the spinal cord, similar to the re-crossed lateral coticospinal tract
  axons described earlier.


In other words, some axons of the lateral corticospinal tract ignore the pyramidal decussation, join the anterior corticospinal tract (which then synapses bilaterally later at the spinal commissure).