My own experience also indicates the stated cause is "fishy". I had a tank go almost 2 full days without power... with one minor loss of a fish that wasn't doing that well anyway. All other inhabitants lived, although 3 of the 14 later got ich. The temp in the tank dropped a few degrees (which actually assists with o2 uptake) while I had a blanket over it for about 40 hrs. A dark tank, as presumably the OP's tank was as the claimed outage happened at night, would also use up less o2 due to the relative inactivity of the fish.
My apologies...but colour me sceptical.
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