I got done playing this game again recently, and the composers credited for the BGM are the same as those currently listed in the "Composed by" field here - Shigeru Araki, Kato Yusuke, Saiko Miki, and Yusumasa Kitagawa. Tomita and Uehara were Sound Director and Producer respectively, which is also what this site currently says. It all looks correct to me. If you'd like me to get some screengrabs of the credits, I can do that.
What I'd personally be most interested in is learning who out of the four of them composed what on the OST, but that's probably not going to happen considering it's Konami.
EDIT: I've uploaded seven screenshots
here.