The original trilogy was scanned in at 2K resolution. (which is slightly higher than 1080p, actually they might've been scanned in at 1080p...not sure about that one)
"DNR" or "Digital noise reduction" gets rid of film noise but blurs the image slightly and you lose detail.

What he's suggesting is to scan the film in at 8K resolution (insanely high) and apply DNR at that level. That way the film will be slightly blurred, but because it is done at such a high resolution, it won't be as noticable and the film will retain alot of detail when scaled back to 1080p for bluray and 2K/4K for cinema projection purposes.