Do Not Attempt disclaimer...
In today's world, I'm sure they have to do this because some dummy would put a pizza with meat and pepperoni on it, or a whole cake with walnut chunks inside or something, and then file a lawsuit because their pump assembly had to be torn out because the insoluble food gummed it up.
I wouldn't even attempt the cake test in my PowerClean if there were any food ingredients involved that don't dissolve in heat and water. Most people don't have common sense though, hence our society of "this could burn you/hurt you" labels on everything we buy.