If you take a look at the original blog post upon which this article is based, they list exactly which companies they include in each category:

https://www.earnest.com/blog/food-economy-spending-data/

"Brick-and-mortar includes Publix, Whole Foods, Kroger, Safeway, Trader Joe’s, Costco, and Albertsons. Grocery delivery includes Instacart, Fresh Direct, Foodkick, Amazon Fresh, and Thrive. Meal Kit services include Blue Apron, Hello Fresh, and Purple Carrot. Prepped meals include Freshly, Thistle, and Munchery. Restaurant delivery services include Ubereats, Doordash, Seamless, GrubHub, and Caviar."