The main reason why I said "frontal area rules" is for the lack of air restriction. A lot of frontal area means that the fan(s) have heaps of orifice area to move air through easily, meaning that a fan can run closer to its peak air-flow capacity.
What is being proposed here is the exact opposite, reduce the frontal surface area for the air to get through, and then worse, double up that restriction, and even worse again, feed the warm outlet air from the first radiator to the second radiator.
Honestly it really doesn't get any worse as a way to do it than what it being suggested in the opening post.
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