I was looking at some parts for another one of my hobbies (air cooled VWs) and came across this piece for a beetle generator, I saw it looked a lot like a certain piece on the proton pack.
A cylinder with holes in it isn’t that uncommon in the world. The N-Filter is a cylinder with 9 evenly spaced holes of the same size in it. The part that you linked to has 8 holes of different sizes.
You can see an alternative angle of it here: Stainless Steel Generator Cover - EMPI
I don’t think this is an “N-Filter found part” as much as it “a thing which kind of looks like the N-Filter from certain angles”.