It's hard to tell with Konami games, because "sound" is the only role in a lot of them. For example, of those Matsuo games I listed, the only one that splits music and sound is Rocket Knight Adventures. He's the only person credited in Esper Dream 2, so he probably composed that, but who knows what he did in the others.
On Twitter and his music school profile, he says that his role was a sound designer, so you may be correct. He does note that he did compose and arrange game music, though.
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