There’s little argument that Vietnamese Pho came from North Vietnam. Personally I like Northern Pho a lot. But the state of pho today is what it is, that is, many people around the world know the Southern pho as the de facto Vietnamese pho. Many non-Viet diners actually grew up eating this style of pho. So it really doesn’t matter because the vast majority of pho restaurants around the world do serve the Southern style.