Drlove reported what he thought was an increase. I don't fault him for that. Where he went wrong is crashing out over Nariont making a very plainly correct comment about there not being any visual difference in song duration between the +3 and +4, and then quadrupling down when pressed for details. I mean, it's entirely possible SE messed up or updated something, Martel's post about Paladin AF feet are a classic example. They even coded Corpselights as demons for some reason (recall in Sheol B, Evil Weapons used to aggro by low HP at one point). So mistakes or translation corrections are possible. The difference in Martel's post is that it's super detailed, even included his own testing plus JP wiki references.
Drlove may be correct in that there's an update somewhere, or he could just be flat out incorrect/mistaken. But getting irritated when someone asks for more information when you've posted nothing besides a short paragraph about your experience does not provide any pertinent details, is weird behavior. Smh