the paragraph after the one you quoted answers this question:
Note that this discussion was based on Japanese law, but the same language is found in the DMCA Section 1201(a)(1)(A): “No person shall circumvent a technological measure that effectively controls access to a work protected under this title.” That law is more than 26 years old, going into effect a month after Google was founded, but the language remains in place.
both the DMCA in the US as well as that Japanese law are implementations of the 1996 WIPO Copyright Treaty. that is why they can be discussed in a fairly interchangeable way.
After shutting down several popular emulators, Nintendo admits emulation is legal (www.androidauthority.com)