Am I missing something?
The Orion-class in-game is also modeled with a fictitious configuration (it's noted as 1934 in the game files - none of the ships survived that long). The Orion that we have has its torpedo booms removed however it still retains the really tall topmast which were all removed in 1915.
So yeah, both the German and British BB lines are plagued by make believe ships. Really, really sad. More so considering that there was ample amount of material to build them as they were in real life.
Also, Iron Duke hurts the most. It was the World War 1 ship to have.