If you find a torrent with the exact same files, yes you can seed without downloading first.
What I do it’s to start the new torrent so it create the files. Pause the torrent. Overwrite the created files with the files I already have. Then verify the torrent. And finally resume it to seed.
Clickbait title. It’s just one case where the cops use the fact that suspects used signal to make the justice think that they could be terrorist.