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Yes, it would offset it. The offset is just very marginal. In order to heat up the coolant faster, we need to move large amounts of heat. Heat is energy. The fan also uses energy, but its (hopefully) moving a LOT more energy than its using.
Its akin to a furnace blower. My home furnace blower fan uses ~300 watts of power, but it moves 80k BTU/hr which is the equivalent of about 23,500 watts.
Also, the fan is only going to be used during warm up. Once the engine coolant is warm, it'll turn off. So, its not a continuous draw.
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