Pretty much true.
The F3 fin design is inherited from the original IDS variant. The original Tornado owes its shape to the multinational 'box-size target' (allegedly to fit into Italian HAS sites but I am unsure on this) whilst meeting the stability requirements for its intended role. In very simple terms if you make the fuselage unusually short then the fin needs to be bigger.
In even simpler terms the F3 fuselage was about the length the aero guys wanted for the mud-moving variant whilst comfortably achieving the original range requirement...