BPM stands for beats per minute, pretty much the time of a full loop in the game. It takes 20 beats per loop in normal and 11 beats per loop in horror, that's what they're trying to say, I think.
no, if it was 200 bpm, loop 1 and 2 would be 16 beats, and if it was 100 BPM, loop 1 and 2 would be 8 beats. look i've been making music for a year, i would know about tempo