I think this was tongue-in-cheek; many in the US (including official people) treat the DMCA as if it was an international law. At the very least, this behavior exists on general copyright issues.

Yes. DMCA had for example a real impact on the TPB case in Sweden. Any work that would start implying that DMCA notices should stop at the border, would run into the lobbyists.

(I guess I should consider Poe's law a bit more in the future.)