Many of those URL magnet links are either not compatible with Gnutella or those that are, are often out of date & unreliable. The concept behind using Bitzi is for finding information & reports, not for magnet downloads.

The reports will help you find out if the file is ok, or if there's other names the file is known under. You can also search the site to find other names a file you're after might be known under so you can search those.