Guild Wars 2

So, I bought the guild pillar on one character, and when I went to craft the shimmering staff on my artificer (another character), it’s not letting me do so.

So I have to buy every guild commendation weapon (which are soulbound on purchase), on the character who can actually craft the shimmering weapon? (whicha re account bound, according to the wiki)?

Yes.

The guild weapons are soul bound, so you need to buy with your crafter character, the result weapon is account bound, so you can give it to the character you want it.

I bought the sword on my warrior but the weaponsmith is my guardian, so I had to buy a 2nd one, craft and then pass it to my warrior.