I have good news and bad news, and maybe-good news.
The good news is that someone did indeed seed the torrent, and I was able to download all the level folders I'd selected.
The bad news is that many of the levels have something wrong with them that renders them unplayable; specifically, their level maps are empty, though the cutscenes, tilesets, audio files etc. are intact in their folders. It's quite disconcerting to see a well-done info screen, an intriguing set of intro-cutscene images, and then Juni falling endlessly through the void...
The maybe-good news is that I have no qualms about uploading the levels not already on knyttlevels.com to knyttlevels.com... IF LPChip (who maintains the level archive) has no objections. I'd also be willing to upload them elsewhere if LPChip says no and someone else has server space to offer.