He wasted his time and effort..imho.
I scanned how he did his test.
He kept used oil to replenish every time he changed the filters he wanted to test after 500 miles on each filter.
Now how stupid is putting used-- 3,000 mile contaminated oil-- back into the crankcase. Where there is no control over contaminant added? He assumes that the contaminant level is consistent from his previous oil change. It isn't.
Each filter was tested 500 miles after he had already gone 3,000 miles between changes. So he kept the used oil in.
Oil depletes. As it depletes it's abilities to hold in suspension contaminant is reduced. which effects the PPM's of any test.
Running a filter 500 miles will have little effect on removing contaminant out of the oil. Which is why he found little differences in the filters. The one filter that did well was his by-pass. Well Duh! A bypass has inherent abilities to remove contaminant a Full-Flow doesn't at better efficiencies.
With 500 miles on each filter where the regular oil change interval is 3,000 miles. That is 16.6% of the filter life to the 3,000 mile change interval. Accepting that there is differences in the media between all the filters tested--at 16.6% life those differences are still small. It takes further mileage as the filter loads it becomes more effective. So better media shows it's qualities further into it's life. Not so much at 1/6th.
Which is why he wasted his time. Imho of course.