Has this particular leaker leaked reliable info on the past?
This seems unlikely. Most licensed Technic sets have depicted very modern vehicles. I don't expect them to make al classic car at this point, especially for a model without a direct successor and an automaker that TLC has never worked with.
However, they sort of have a precedent with the Creator 007 Aston Martin of releasing a car with both a manufacturer and a movie license, so I don't see that part as much of a strech. The double license can also bring fans from both properties to the set.
But, as always, don't forget the grain of salt.