Nice video, BUT
Their demo fails to take into account the most important factor in lint adhesion: the steamy dryer exhaust. While I can't be sure about the fineness of the lint they dumped into the test chambers, fine lint readily adheres to moist surfaces and believe me, dryer exhaust runs get moist. The major exception is the venting from an old WP perforated back cylinder dryer. Enough air passed behind the drum that there was always enough hot dry air going through the venting to keep the condensation in the pipes low. My frankendryer with the 37.5K BTU burner runs at a steady 165F and it boils the moisture out of the load so fast that the brick area in front of the vent hose is wet with condensation, even on hot summer days.