[Tervuren]

Javadog's point was that spaghetti is a type of noodles and that Bolagnese is a cultural preparation of how spaghetti is presented that involves lots of meat.
He wasn't saying it was the only way to present spaghetti; but rather that it isn't Bolagnese without meat.

Point being that in a similar fashion he sees Pho not as a soup with noodles but a cultural preparation that specifically revolves around meat as a key item to the flavor.
Take away the meat, and the cultural dish is removed from being what it is.