correct. the game is not an actual psx game and it's merely just a demake-inspired psx. it just loads the .exe from the disc and plays it just how you would load the .exe from your folder
I made a .ISO of BBPSX with the Windows autorun and now the game can be played directly off a CD with the correct Label and Icon showing up on Explorer
Short video of the burnt CD. Give it a try to experience the authentic PS1 way