Yes, and no.. it's partially correct but also partially full of shit.
Short version; current car is a new build in the 70s. Original car was an FI development car before being sent to Cross (less FI) for engine development work. Only thing interesting is the engine, and the private plate that's now been removed.
Dealer has picked out the interesting pieces without the context. Any buyer who thinks they're buying history will be rather disappointed.
Much like the description on JXC813D's auction, saying it was the only surviving P6B development car.