The section 1201 text was from the email OP received, I was just quoting that verbatim.

But 1201 deals with circumventing copyright protections and AFAIK isn't related to DMCA takedowns, but 512(h) is what I've seen typically used for DMCA notices instead, to get the identity of a poster in order to sue them (since the ISP itself is exempt as a conduit), so that's why I mentioned what's required for it.