When there are museums that consider you to have invented it, and you DID invent it (just perhaps were not the first, though that was not known at the time), it seems fair to say that you did.
After all, we consider that both Newton and Leibnitz invented calculus.
I saw lots of love for Diffie's "I invented it" line. But if he overplayed his hand, he ended up hurting his side more than he helped it.