The youtube vid was private so I couldn't see, but I don't think the lint is flowing differently--I was thinking that the radiator unit basically just wraps the existing exhaust duct, or replaces a section with its own enclosed tube. If you weren't having a lint issue before this won't be any worse.
We had a crude diverter on our dryer exhaust that simply flipped down a door to point the air back into our basement. Had a filter on it that sometimes worked to keep most lint at bay. Now that we finished the basement we don't use it since it created a ton of dust. But this idea looks very promising!