If you're talking about Seattle, Kroger closed that store because it was underperforming for years, not because of a temporary wage increase that affected every grocery store in the city. Weeks later, they started advertising open positions with wage increases for nearby stores they didn't close...
When it comes to political decisions, firms lie all the time about their motivations. I don't understand how anyone can take what they say at face value, without any means to verify their claims.
The reality is that nobody closes their grocery business because labour costs went up for them and their competitors. Customers still need groceries to live, and you and your competitors just pass the costs directly to them, without any change to profit margins or market share. Closing your grocery over this is as nonsensical as closing your grocery because the spot price of milk went up to $15/gallon.