Actually 1010, by your own standard it is neither proved nor disproved. You yourself have said it speaks nothing of what went before, so it gives no information as to whether matter was already there or made by God. So we have a draw in that regard as far as what is said about the universe before Genesis.
Now, given that even in the very Hebrew reference you gave me the word created is used, not ordered, reorganized reshaped etc. if we are to make an argument that one side or the other was making suppositions from the text, created supports the "from nothing" far better than he just showed up found some supplies sitting around and decide to toss together the Earth.
I know a weak set of Gods is a necessity for your LDS beliefs, and I know the spiritual gymnastics's it takes to support that, but this one is just to easy.
First, I don’t set the standard, God does. His Holy Bible is clear on ex nihilo creation, there is pre-Genesis matter being worked on. That doesn’t destroy the majesty, power and wonder of His creation. It just means it wasn’t, as recored in the Bible, ex nihilo.
Reading it again will help:
Here’s Genesis 1: http://bible.cc/genesis/1-1.htm and 2: http://bible.cc/genesis/1-2.htm
Young’s Literal Translation makes it clearest:
In the beginning of God’s preparing the heavens and the earth — the earth hath existed waste and void, and darkness is on the face of the deep, and the Spirit of God fluttering on the face of the waters,
That’s verse 1 and 2 from Young’s Literal. It is obvious now, no?
The Biblical text states clearly that the earth in its void/formless/empty state was there to be worked on already. It’s existance doesn’t undermine the power, authority or majesty of God.
His first act is contained in Gen. 1:3. He tames chaos/disorder by immediately declaring light. There are a lot of great scientific attributes of light that make this beginning so amazing. There are also wonderful religious metaphors for light, not the least of which is joy.
So enjoy yourself, God and His Holy Word.