You're not downloading a movie to watch, you are just "acquiring training material" and "reviewing" it to make sure you can use it to train a high-quality model.
I’m not a lawyer so I’m sure there is more to this definition.
Torrenting gets you in trouble because uploading at least a little bit is inherent to how it (and some other P2P) is supposed to work, and that's enough for a case.
Cases against people just downloading have always appeared to be very rare/non-existent, at least from when I used to follow the news on this stuff more. I don't think I've ever seen a case of someone threatened for solely downloading off direct download services, for example.