Age, engine code and badge suggests 290 then.
I dont think it's uncommon for a V5 to be wrong. My 184fr had Sports Tourer on it and wasn't. My Cupra just says "Seat Leon Tsi".
I recently watched a video on YouTube on salvage rebuilds where they bought an RS 2000 (the later one) and it was registered incorrectly. From memory they found a contact at DVLA and had to prove what it was and could get it changed.