An interesting concept, no doubt. This is definitely a new approach and if it pays off the company will benefit greatly. On the other hand, the risks are significant and I see a lot of money being poured into this. Walmart showed many times it doesn't have the capacity to attract wealthier customers and the facts say that WM should stick to doing what it does best. This is potentially another failed attempt to appeal to a different group of customers.
https://www.fool.com/investing/2018/11/17/will-this-risky-bet-pay-off-for-walmart.aspx