I freeze cabbage soup and it is fine. The cabbage is cooked.
I freeze an entire head of raw cabbage, and when I go to make cabbage rolls out of it, I put the cabbage in a sink of water, which slowly thaws out the leaves, one layer at a time .. which I peel off .. and because of the freezing they are now soft enough to roll INTO cabbage rolls. Which are then slowly baked in tomato juice until the rice filling has cooked and absorbed all the juice,
I would never freeze a cabbage if I intended to eat it raw. That might work, after all, but I would not expect it to work.