The translation is a bit tough to follow regarding DreamHost. Something about "closure...because they did not know." My guess it's about shutting down the site, possibly for inciting hate crimes, which I doubt is covered by the First Amendment. The article says they didn't get full access to the site, and their hack was via access codes which could mean that the authorities got someone's user ID and password.
Not being privy to DreamHost internal workings, I don't know the truth behind the access and shutdown.