Memoirs Are Not the Big Four, Right?

Memoir itself is a category that i think falls underneath these big four silos, right? So a memoir in and of itself, i don't personally see it as one of the big four. For example, you write a memoir that's narrative non fiction. Or for example, like tiger woods wrote an instructional book, and he called it how i play golf. And then lastly, there are memoir slash big idea books. In fact, i just finished writing one with a brain surgeon where we together figured out that the best way to tell his big idea would be through telling his personal story  of how he became a brain surgeon.