this is not a new thing, that there is PS2 games that take language from bios settings.
and it takes some time to figure out by booting up console/emulator, switching language and starting the game.
the util makes the process little bit faster
tested with latest "pcsx2" and "ps2-0230e-20080220.bin" bios
videos to show the process
language selection
https://youtu.be/cLDYhJ87AV0
region selection
https://youtu.be/y3WDUWz5R2c