Courts have found that scraping data from a public website is legal, because data is not protected by copyright. But copying protected works without permission is generally illegal, it doesn’t matter if you use a scraper.

If the defendants in this case admit using RIAA works, then they will probably try to argue fair use. At that point their product will become relevant, including its commercial nature. This will weigh against them, because their songs directly compete against RIAA songs. In fact, that’s why artists who include samples in their work usually obtain permission first.