yes, you are correct technically. but if you go on any adult website like rule34 and look up futanari, at least 50% of what you'll find is just male genitalia+boobs. so yes, you are correct, but most people just categorize futanari as "anything with male genitalia+boobs, female genitalia optional"
Futa can be put under Dickgirl but not the other way around. It's like squares and rectangles. Squares are rectangles as well, but rectangles are not squares. Just because someone that is ignorant calls it Futanari. Doesn't mean that it is. Because so many people are miss tagging their work I've started to see Full Package Futanari as a tag now. Some works you can't tell because of angle or its obscured, usually by ball sack. That's why I asked. Because the screenshots don't show, and the tags don't help