Here's another one, different king, similar inscription: https://en.wikipedia.org/wiki/Spear_of_Fuchai - seems likely it should be read more as "caused this to be made".
That said, while it's possible this King was really into swordsmithing, more likely he's just taking credit for the work or something gets lost in the translation. Like if Elon said he "built the Falcon 9". It's not explicitly true, he certainly wasn't machining parts or writing code for it, but he was involved enough that no one would really call it a lie either.
Yea, that would be the way I read it: He "built" the sword just like the executives of your company "built" its products. It's like those home remodeling TV shows, where the remodelers don't really do anything besides write checks and drive around talking on their phones to other people who don't really do anything either. All the actual building is done by silent building contractors who are mostly off-camera.
The books are filled with names of kings.
Was it the kings who hauled the craggy blocks of stone?
- Bertolt Brecht, Questions of a Worker who Reads
The elite/aristocracy of these old ages was at the top for reasons that make some sort of sense even though it could be violent it would be perhaps not completely uncorrelated with ability, if a prince is born into it they’d sometimes get taught multiple languages, music, poetry, on top of the reasonable politics and warfare, strategy etc. As for craftsmanship that is a good question since it’s working with ones hands but with the examples here so far it would make sense if they could just get instructed by the best craftsmen as well to learn that too of course this is maybe too far backwards and another continent to extrapolate
So we kind of have to guess. My guesses are not the most informed.
The sword (https://en.wikipedia.org/wiki/Sword_of_Goujian) is bronze, so it was probably cast (you can forge bronze but the cost/benefit ratio is terrible). You could imagine a king pouring the hot bronze into the mold—that would be much quicker than forging an iron sword—but you probably wouldn't want him to make a habit of it, because contaminants in the metals would expose him to arsenic vapor, though this sword in particular is almost arsenic-free.
Then all that's left is sharpening the blade, which any warrior has to be good at, and what is a king if not a warrior foremost? So it's plausible that a king might have put in most of the work embodied in the blade himself, with a grindstone, even if he didn't go around casting bronze regularly.
Nuclear power plants or walls that are supposed to cover an entire border require thousands of workers and engineers. At that point the organizational/management aspects, acquiring of funding etc. become much more important than the direct contribution of any specific engineer or craftsman.