this meme has some truth in it, in that these six vegetables are all brassica oleracea. but, the factoid in the center of the meme is misleading: brassica oleracea can be many things but (despite brassicaceae being “the mustard and cabbage family”) brassica oleracea is not typically called “wild mustard plant”.

edit: toned down my refutation; i guess maybe it is sometimes 👀 but i think not really