Okay, so you not being able to spot the difference does not mean there isn’t one. While your “nuh uh’s” are kinda funny, you can’t just redefine words any time it’s convenient for you, not when they’re commonly used by others. Not all deflections are whataboutisms, just one single type, specifically, to an accusation. Like the very first line in the article, that says:
the strategy of responding to an accusation with a counter-accusation
So, it’s what we call a hypothetical, where I was proposing two axe murderers that targeted families. It’s just a possible thing that we can think about to discuss a finer point. So, if we say he has kids, since he doesn’t exist in the first place, then he has hypothetical kids.
edit: Just to save you a little scrolling, since I’m such a nice guy: