

I’ve personally encountered some hybrid torrents on public trackers. Even if you only have the v1 hash, your client fetches the information of the v2 version from compatible clients, which is pretty neat. Maybe this was done by people trying to promte v2, but it is more likely that they used qBittorrent to create thier torrent, since if you use the newest version, the default option when creating a new torrent is to create a hybrid torrent.
iknowwhatyoudownload.com is pretty unreliable. It lists some torrents downloaded from that IP and then likes to add some torrents (mostly porn in my experience). I’ve tested this with many connections over the years, and it’s not just sharing/rotating IP addresses that triggers this.
(My use case for iknowwhatyoudownload.com is mostly to see what public torrents other people have in their seedboxes.)
Also, I wouldn’t worry too much in Germany unless you’re downloading the latest YTS release or something. There are a few horror stories out there about being sued, but they are mostly exaggerated and not recent. That said, your setup sounds very solid and you should still use a VPN.