It looks like he has been involved with the PS4 scene in some capacity as of late.
https://www.psxhax.com/threads/ps4-modchip-matrix-mtx-key-for-firmware-4-71-4-72-demo-video.2498/page-7#post-26755
Take a look at this thread: http://assemblergames.com/l/threads/n64-gameshark-pro-repair-attempt.46208/ it's a little more technical than most people would go into but there is a lot of good info and documentation.
Ha that'd be crazy to say the least. I was surprised to see that the Action Replay showed up as a hacked Game and Watch rom. I never really knew how they worked before.