I did not get that vibe at all. They do make it clear what the game is, but in the back they give you the tools and some ideas to expound upon it.

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Being a forever GM I can subject my players to whatever system I want! Delta Green has become one of their favorites.

I can agree that most of Paizo’s adventure paths can be lackluster. I highly prefer PF2e to 5e, but my favorite adventure paths are the 3 part ones, Stolen Fates, Quest for the Sky King’s Tomb, the 6 part ones definitely feel like they’re stretching a plot to reach 6 parts and should have broken it into separate stories or fewer books.