"Independent testing by" a magazine
.
Testing comes from a lab.
Advertising and circulation generation come from a magazine.
... and never the twain shall meet.
(proper citation to Rudyard Kipling!)

I've gotten to the point of skipping over any magazine articles that purport to be a "test" of a product that just happens to have a full page ad (or two) in the same mag. And in the case of all the magazines I've read specifically directed at Harley riders, the staff of the magazine isn't technically competent enough to
describe a valid test, much less perform one. They usually just take the bike and device to be tested to a convenient dealership nearby, or even better to the folks selling the product, and have them do the install and a dyno run or two. The one's I love the most, however, are the so-called "road tests" of new Harley models. Once again, no technical explanations or actual performance numbers like acceleration, braking, etc., just a regurgitation of the sales blurb put out by the MoCo, usually limited to one page or less of actual text.
As for the mesh filter and the performance improvement, the only way a filter can improve engine output is by reducing the resistance to flow, thus reducing the amount of power consumed by the oil pump. The way a filter reduces resistance is by using less restrictive filtering media (bigger holes) and less of it. If you prefer a comparison from a HVAC system, take a cheap standard furnace filter and compare it to a pleated filter like the 3M Filtrete line of filters. The cheap filter flows more air and places less drag on the blower, but it doesn't filter out anything smaller than a chunk of gravel and quickly allows the blower and ducts to be filled with dust particles. The Filtrete version filters much smaller particles, but the better filtration does cost a little more in terms of air flow. Which would you prefer, lower drag or cleaner air (or oil in the case of the engine)? As a wise person once said, there is no free lunch, and you don't get anything for nothing. When people try to sell you a product that promises something for nothing, a wise person walks away.
Jerry
PS. If you think it's really worth it to go with a less effective filter just to gain a couple foot pounds of torque, let me offer up another idea that will expand on that performance gain. Remembering that it's all about reduction of the resistance to oil flow, just think how much more you will gain if you use a thinner fluid that will also reduce the resistance to flow. The ultimate system would be to eliminate the filter completely and also run 10 weight oil. Just make sure you don't try to sell that bike to me after you do this.