Not that one slow day proves anything, but it supports my own skepticism about warm fronts in the winter heating up the fishing.
I've never really found that a couple of warm days does anything to reverse slow fishing. It is February, and oxygen levels in many waters are very low after being covered with ice for more than two months, and snow for most of that. This warm spell will get run-off going in to many ponds and lakes, plus melting the snow off and getting light in to the water to get plants growing again. That will help fishing, and is part of the reason late ice is a good time to fish.
Still, I'll take ice-fishing in sub-zero weather in December over fishing a warm spell in February any time. Cold weather or no, those first-ice fish are the easiest to catch.
