Yes I believe they now only host magnet links. I believe they did used to have .torrent files. I am not sure if .torrent files actually make a huge difference in copyright though do they? Aren't they still almost the same as a magnet link just essentially a different format?

I believe they switched to only magnet links as it made it easier for them to be mirrored and switch around providers to hide from authorities without having to worry about all those files. Also most people likely use magnet links anyway.

TPB has been subject to a decade or more of direct actions by more than one government. Their resilience is fairly impressive.