Based on the size and proportions of this, I'm guessing this is a drumette and not a drumstick. But, I'm also I'm not sure a photo of a single piece of chicken from a single order is really evidence of much of anything.
It's not a "usually" thing, but yes there are bone-in and boneless (aka de-boned) chicken wings available in the USA. It's quite common for establishments, especially fast food or convenience restaurants, to offer both options but not all places offer both.
The higher quality boneless wings are typically made from drumettes like the piece in OPs picture above, but with the meat pulled off the bone. It's often cut into "nuggets", breaded, and deep fried. Sometimes other cuts of meat are used, though, like the breast.
The lower quality boneless wings are usually just barely more than ground up chicken parts mixed with binding agents, similar to mass produced chicken nuggets but usually not quite as uniform in shape and texture. Basically one step up from "pink slime" or chicken dough based nuggets.
I'm completely with you. I got KFC (just breasts and legs) and these were the legs I got. My only explanation is that the other comments in this thread are right and we got scammed because it's "close enough"
It's also possible that it's a case of the employees not giving a fuck. Otherwise KFC would have to be buying pullets from the poultry farmers, which doesn't make much sense from a financial standpoint for either side.