The article in the OP was correct in saying that a guitar will sound like a guitar. Thus the idea that any wood that will hold together, can be used to make a guitar.
I remember the pallet guitar article but I have never played a pallet guitar, so I have no idea how good it sounds.
Now if you want to talk about top woods, that will be a whole different story.
There are very few woods that will work as a top wood for a guitar.
I think that the top of the guitar gets credit for the majority of it's tonal qualities.
Build is also a major factor but you have to have quality material to start with.
So in the end, I still think that the type wood that a guitar is made from will have a dramatic impact on how it sounds.
To go even farther, why does a composite guitar sound like a guitar?
Because it is a guitar!
Does it sound like a guitar that is made from wood?
No, but some of them sound quite good.