ولا يحتاج إلى شيء أصلا
And He depends on absolutely nothing.
Independence follows from necessary existence. A being whose existence is caused by another is not necessary in itself: its existence depends on something beyond it.
Keep two questions apart:
1. Does a thing exist?
2. Is its existence intrinsic and necessary, or is it dependent upon another?
Actual existence alone does not demonstrate necessary existence. The second question is what matters in the analysis of the world and its constituents.