Gravity is a law of the universe, having no application outside of it.
I guess then you are arguing the universe is self creating according to current knowledge of gravity.
That may be true, but Hawking can't explain how it began.
I don't really know what Hawkins said nor do I care. But if he is trying to say that the Universe was created by natural law then he is either accepting there is a God, who laid down the natural law, or he is just ignoring the ramifications of what he said. Much like saying that baseball wasn't created by rules or by intelligence.
My thought is, the Universe was created by the only logical entity, God. Whatever one want to believe God to be the conclusion is logical. God created the Universe out of Himself, energy to matter, and He used the law of nature to do so, so Hawkins is kinda right. I can really understand Hawkins being bitter and lashing out at God.