In some strict sense that may be true, but in this discussion I think it is reasonable to read 'Content ID' as including YouTube's copyright strike system, demo

In some strict sense that may be true, but in this discussion I think it is reasonable to read 'Content ID' as including YouTube's copyright strike system, demonetisation, and re-assignment of ad revenue to the claimed copyright holder. These things are all very much extralegal, and used instead of the DMCA in many situations.