I have heard of that idea several times over the years. That is great that there is some real data available, but myself I will not take the time to read it.
There are often some "proofs" if you will, that trump so many of these bright ideas. These ideas are usually based on incomplete understanding of how things actually work or are a band aid that seems to help but is done instead of actually fixing the real problem.
Having said that, anything restrictive or disruptive to the laminar air flow that you put below a carb, like a screen, will lower the signal to the high and low speed metering circuits. That is the last thing you want and can only hinder fuel atomization where it is supposed to actually be happening. If the weaker signal helps by leaning the mixture, then the jets should have been changed and the carb allowed to do it's job. The place to look might be venturi and emulsion tube design, but not some BS hanging in the path downstream.
Carb performance comes down to balancing the strongest signal possible, with the least restriction possible. A screen just hurts both.
I would spend my time and effort getting it jetted right, or getting a better, more modern carb and getting it set up right. Cleaning up the throat of a carb and the boosters, removing casting flash, can help fuel mixing.
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