from the SS Course, why do we move the physical offerings addressed "to those whom I owe debt and who owe debt unto me" outside the temple? does this also mean to move the physical offerings outside of the house?

If you have physical offerings for them, yes, move them out of the house. The idea is that these beings are pissed off at you and most humans. You want to give them something to make nice, but you don't necessarily want them hanging out in your living room

Incidentally, the picture to the left is an offering to such spirits. I took the photo in Pharping on the 3rd day of the Vajrakilaya Puja held  in Kunzang Dorje Rinpoche's bedroom. 

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