That's just savings in end-user monetary expenses, which is a proxy for energy use, but not necessarily a good one.

I wonder whether this calculation holds once you account for the energy used to develop, construct, market and transport the new fridges that replace the older-but-working fridges. It's a genuine question - I haven't seen such calculation done. My current intuition is that the extra marginal energy used in manufacturing a new fridge dwarfs the energy savings of replacing the old one before it dies.