The original article that went with the picture spoke of "a new race of amazons" and calls the woman on the right, "Diana", which may be a reference to Wonder Woman (AKA Diana, Princess of the Amazons).
This article is a perfect example of linear extrapolating.. They were like "huh, when you feed people a balanced diet with proper nutrition, they get 3 or 4 inches taller. This trend will obviously continue until people are 10 feet tall in a few generations."
They weren't as far off as one might think. If everyone had a standard of living growing up that scaled with trends at the time, women would probably be taller than they actually are.
When I was 5' 11" and starting college as an honors student, I was shocked that most women in the program were around my height or taller, while the men were all taller than me. I think it was mostly because the other honors students came from well off families that pushed them to have high GPAs, made them eat healthy as they grew, and gave them every other possible advantage. Honestly, they didn't seem much smarter than many other students I later met. They mostly had privileged upbringings.