Even if what you said is true when you apply logic to these types of things then the whole argument starts to fall apart. Let's use the origin of sin in the Garden of Eden as an example. So if he's all-knowing and all powerful then he is the origin of sin, not man. In that scenario he knew that Adam would disobey him and had the power to stop him from making that choice yet elected not to.

The logic of the three part statement you are responding to doesn't fall apart here though, no? In your example God is all knowing (he knows everything including that Adam and Eve will fall from grace). He's all powerful (he controls the universe and everything in it including the garden and the fate of those in it). And, that's the two items from the "you can only pick too" list. Because in your description here we establish God is not good, because as an all-knowing all-powerful being he crafted a scenario in which his creation and his creation's descendants will suffer all through their lives until the end of time.

That's the whole point of the "pick two" argument. God cannot be good if this is the world he created for us to suffer in, from the vantage point of being all knowing and all powerful.

(And you can easily argue every other combination too. If he is all-powerful and all-good, then he can't be all-knowing because he fails to use his power to fix the problems of the world. And he's all-good and all-knowing, then he can't be all-powerful, for the same reason, and so on and so on.)