Yes, you are reading in too much. Single family means the house is not attached to another house as a townhouse might be.
When a house is advertised income or investment it means that the owner might want to purchase it to live in themselves or rent out. Normally you will see income or investment for a property in an area where there are already many rentals or where the house is a rental at this time. In either case when you buy it it's yours and you can move in or rent it.