Almost none of the food in a Wal-Mart or any other US grocery store originates in China. Gadgets, geegaws, clothing, etc perhaps, but food? I know it’s popular and fun to hate Wal-Mart, but at least get your facts straight.
Most of the Walmart brand packaged food I’ve looked at only says “Distributed by”, not “Made in” or “Product of”. If they don’t want to tell me where it comes from, I assume it’s China. It’s not worth the risk, IMO. This behaviour is not specific to Walmart, BTW.