Heat naturally flows to the lowest temperature object connected by the lowest thermal-resistance (or highest thermal conductivity).

If you have a radiator at 80C, and a 2nd radiator at 60C and both are connected to HotPlate-X, the heat will naturally find itself going to the 60C, while the 80C will more naturally find its own heat radiating out to the environment quicker.

You don't need a thermal-semiconductor to just have heat flow around. That's just... heat physics.

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There seems to be some practical applications for this new "thermal semiconductor". Though the next questions are that of cost, performance, etc. etc.