Pity. Styg doesn't want us to double aoe boom-boom. It's mentioned in some patch notes or anywhere? Been looking on wiki and patchnotes, but found nothing. Google also gave me no result on this matter.
EDIT:
I think i was right, and it's not intended. Did some tests, and looks like "Warmed Up" status prevents explosion from Thermodynamic Destabilization while target gets killed specificaly by Cryo Orb. Targets unaffected by "Warmed Up" explode normally while killed by Cryokinetic orb. Every other psi skill is causing explosion even on "Warmed Up" targets.
EDIT2:
Tests above were done on humans. As for rathounds, casting Cryokinetic Orb or Cryokinesis on target with Thermodynamic Destabilization causes removal of TD. Interactions are quite inconsistent.