The article is 5 paragraphs long. Is it really that hard to read it and answer your question? Nevermind, I think I misread your comment. Sorry!

What Sony is specifically trying to do is see if any AI song can be traced to specific songs- e.g., if someone prompted “make me a song in the style of Lady Gaga”, would Sony be able to conclusively determine this based on the outputting song?

I am a bit skeptical of this working, but then again, there were some image generators spitting out gettysburg watermarks.

I think you misread it - 71% said drive. 29% is still pretty bad, but it is kind of a “who is buried in grants tomb” question.