This is an interesting article that contains a truthful observation of what Walmart is missing in its strategy regarding e-commerce and its quest to take on Amazon. Tend to agree with the fact that, with these kinds of investments into technology WM will catch up in that segment, but other pieces of the puzzle are where WM is still behind. I recommend this article as a good read.
https://www.forbes.com/sites/panosmourdoukoutas/2018/12/08/3-things-missing-from-walmarts-strategy-to-beat-amazon/#7f3c984d23c0