Because they're a library with a DMCA exception (which may be expiring soon), they are allowed to host that content. That doesn't mean you are allowed to downlo

Because they're a library with a DMCA exception (which may be expiring soon), they are allowed to host that content. That doesn't mean you are allowed to download it though. Normal copyright and DMCA law still applies to you as a consumer of this content. Also Jason Scott has stated that they prefer to take a stance of "just upload whatever it is first, then if someone complains we will take it down".