You are correct. I realize that the new codes do require a 4 prong cord and plug. All new dryers however can accept both 3 and 4 prong cords w/o any problem so that they can be used in both new and old houses. There is nothing "risky" about using the 3 prong setup if that is what is in the house. Also, this person may be renting and there could be more trouble getting the work done or ok'd by the landlord.