Someone managed to access the PlayStation Classic's secret menu

Although the PlayStation Classic is a faithful miniaturization of the original console, it's simply an emulator, and the people at YouTube channel Retro Gaming Arts have managed to find a way to access the console's secret menu.
Using a simple USB keyboard (although the video creators note only Corsair and Logitech keyboards seem to work) and hitting the Escape key when a game boots up, you can access the menu which allows you to manipulate frame rates and what appears to be the ability to enter