SH4 is criminally underrated and hated at its time for being "too different", got criticized and sold poorly, causing Konami to giving the IP to soulless western studios for 2 decades. It was supposed to be a standalone game called "Room 302" but the higher-ups wanted to mix it with SH for marketing/sales. So they call it SH to sell better, then the game is hated for having the SH name.