I think he was being sarcastic, and i think it's because strlen(quantum)/strlen(eris) is much closer to the golden ratio than "quod erat". "Quantum electrodynamics" is another famous acronym that follows the golden ratio (+- 30%)
Actually, it's probably a Discordian thing. Eris and Fives and all.
Actually, in context, "the amount you will to be proved" actually fits at least as well as the traditional interpretation of QED. The amount in question is either the golden ratio or 5.
that's an Englishism; 'eris' can't mean 'want' in Latin. But I believe a better translation is: "How much will be of the [people/things] explaining."