It almost sounds like hes implying that the people who made it are still around. It could also just be something he said just to spite the creators whether they were dead, alive or supernatural.
Just a little tidbit, there is a small easter egg (well i think its an easter egg) that could be taken as more. On Phantom Ganon's sword, it says Zabora Gabora (not sure of the spelling) which is the names of the blacksmiths in Termina. Just thought i would throw that in there. Maybe they made the sword and somehow got it to Hyrule.
Well, i'm surprised no one has mentioned OoX yet. In OoA, if you tell king zora a secrethe'll reforge your noble/white sword into the master sword.
but most people dismiss this tidbit, seeing as it contradicts the theory of the sages forging it (unless king zora was a sage) and OoX is near the end of the timeline, or at least after all the other games with the MS in them.