It’s in the video provided in the article. It’s pretty complex and lengthy. You have to put in like 3 cheat code menu entries, then go to a level select option and hold down l1 and x, then the disk will stop, oh you had to keep your disc eject propped down so the console won’t detect the tray has been opened, switch out the disc, hold like triangle and x, let go of l1, triangle and x all at the same time, then it will boot into whatever pirated disc you switched out without the checks.
I can see why it’s not in the article, it’s hard to accurately write down and it would be almost as long as the article itself. That said, I don’t know how much of a godsend this is, it requires a copy of a pretty undersold and otherwise mediocre game. That said, I am not that into retro gaming so maybe this is truly a major change for the community.