What a strange article - a discussion of Walmart's ecommerce technology without a single mention of its jet.com acquisition, which had over 1,000 employees in 2016 (https://en.wikipedia.org/wiki/Jet.com)?
The article is not praiseworthy enough to be a PR plant, and it lacks any substance from insiders. Seems to be tea leaf reading more than anything.
I'd also add that the acquisition cost of Flipkart was largely driven by direct competition with Amazon during the bidding process.