There is certainly a possibility the owner manual is wrong, especially for the first printing on re-designed vehicle like the 2020 Explorer, but I would not buy one until there was some official statement yea or nay. If neither the sales organization or the Customer Service line can get the answer, that doesn't bode well. If somebody comes back and says the manual is wrong, get that in writing too.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC