first of all that's an Australian, please the US has enough to be ashamed of we don't need these kinds of false accusations
second of all I absolutely thought this was a joke but I went to his profile and now I can't tell. All his videos up until that point were just gym videos, no jokes, then all of a sudden he posts this cabbage video. He made one video after that seems like it's supposed to be a joke, but it's not funny at all and just a weird video, maybe it was an attempt to make the cabbage video seem like it was actually a joke the whole time. Then the next video is an apology for not knowing what cabbage was. So idk, doesn't really seem like a joke, especially when his actual attempt at a joke video landed so poorly.
America has tons of cabbage dishes. The northeast variants are more Irish influence related to the traditional boil and the south has mixed greens which is a take on collard greens that mixes em with cabbage. There’s also the rare( here at least) , but delectable, fried cabbage. Seriously, cabbage fries well. Just try it and it’ll work.