Is that fuzz you speak of ferrous? It must be if it sticks to a magnet. Large chunks of iron wear? What does an oil analysis show? Just questions that maybe you cannot answer. Are these particles too large to show up in an oil analysis because they are too heavy to be suspended.? Why doesn't the oil filter remove them?
Forgive me but sometimes I think Blackstone's analysis and conclusion statements are over rated or over reacted to. Just think about 200 parts per million. That is 200 parts suspended aluminum in a million parts of oil. Think of sub micron aluminum particles as 200 hundred gallons in a million gallons of oil. What is that in one gallon of crank case oil? How much actually wore off the bearings? And there are four of them.
Well, do you do you actually feel that that plug will increase the longevity of your new engine. Millions of miles have been put on TDI engines with the standard oil pan plug without collecting what ever the unknown substance is that has been collected by a magnetic plug.
Another thought for the sake of conversation. I don't change my own oil anymore so I can't speak about what I am about to ask. Has anybody seen anything that resembles what the OP is describing on a plain old fashion steel plug? Is this same fuzzy goo in the bottom of the oil pan also. Maybe it is just sludge. And it would stick to any plug magnetic or not.