That does not sound logical ... plants do not absorb E. Coli, it's an aerobic bacteria, it cannot live inside a plant. Flatulence is one of the byproducts of the digestive process of the bacteria, ergo, the spinach would blow up.
Sounds to me like propagando, because frankly e. coli is related bacteria that are in the soil already. Soil is NOT a sterile medium, it's loaded with all sorts of critters bacteria and microbes (if it weren't, it would be dead matter and nothing would grow in it). Just like WE're loaded with bacteria, viruses and microbes that make up the microcosm of our bodies. Bacteria are what digest our food, without them we would absorb no nutrients.