Those are ancient dinosaur corpses. He’s talking about ones that are fresher. Interestingly, I couldn’t find any data on how long it takes for a chicken to get from a farm to the grocery store.
From birth: Six to twelve weeks depending on breed.
From death: one or two days.
"Retail products are usually delivered to a retailer’s warehouse the day after leaving the production plant. Most often, chicken products get placed into company grocery stores the same day of delivery." [1]
