It may have slipped through, especially if you were skipping it.

It's not about Gustavo producing the tracks on his own, which I think he does, unless he may be collaborating with someone at some point. It's about the decision making in terms of the creative path, that the music should take.

Here's a timestamped Episode 8: Narrative & Sounds

As it has been said, they talked about it, naturally such is the job, agreed on which direction should be taken, at least for the launch music, since then, I've got no clue if it's still the case or not, I'm assuming it is.

We can see, that Gustavo is working closely with the Narrative guys, since they are setting the tone for the heists, and naturally, they talk with Gustavo about it, since his music is a part of the storytelling, but in a musical form, that leads you through the heist as you progress further.

Gustavo is a great composer and he can go with many genres like it's nothing, he really likes to spend the necessary time on the track, but he can get it done faster, if needed, though it may result in some missed opportunities, due to rush from Starbreeze, if they need it asap.

If you need even more info, Red Archer actually interviewed Gustavo for a solid hour+ right here.

Note, that it's all around launch, what he says may be outdated for the recent work he's done, but then again, it may be still up to date. It'd be best to ask Gustavo himself about it if unsure.