The term "official Walt Disney World hotel" refers to a group of non-Disney-owned hotels that are located along Hotel Plaza Blvd, near Disney Springs. They have Disney's stamp of approval and are located on WDW property, but they're not Disney resorts, and aren't eligible for the perks you get by staying at one of Disney's resorts. So, no extra magic hours, no Magical Express, no dining plans, no early booking of ADRs or fast passes, no magic bands included with your reservation, and they're not on the Disney transportation system. They run their own bus service to the theme parks.