After shutting down several popular emulators, Nintendo admits emulation is legal
(www.androidauthority.com)
Which law exactly?
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.