To say that a tall bike like that can't be created in the real word is pure ignorance bordering on plain stupidity.
It could be created like that, but it wouldn't be. Look closely at the intersection of the upper bottom bracket and the lower top tube-seat tube-seat stay junction. It would be needlessly complicated to mitre all those tubes on the lower frame to accept the BB-down tube intersection of the upper frame.
It could be created like that, but it wouldn't be. Look closely at the intersection of the upper bottom bracket and the lower top tube-seat tube-seat stay junction. It would be needlessly complicated to mitre all those tubes on the lower frame to accept the BB-down tube intersection of the upper frame.