No, I'll stand by it.
Enzo Ferrari is indeed quoted as saying that: I don't have any issue with it and certainly would have no wish to denigrate the E Type's classic status. The point being that E Type sales were so small at the end that the factory had difficulty shifting them, and the value of used examples must have gone through the floor (admittedly the 1973 oil crisis didn't make things any easier).
Some years down the line and it's a different matter. But I think there are big differences between Classic, Perceived Future Value and Collectable, and we're back to "What makes a car a classic?"