Well he survived it, but his wife (that was downstairs in the kitchen) sadly didn't, seems like that size of tornado it was basically up to chance.
Everything's up to chance in a violent tornado. The guidelines I posted are the ones that maximize your chances for survival.
Also- highly unlikely that the downstairs kitchen was an interior room. Kitchens rarely are. "Well he survived it" doesn't make what he did smart. That would be like arguing against wearing a seatbelt in a car because of one particular wreck where a guy wasn't wearing one and lived.