SNAP changes like this may be better on a population health level, to be sure. On this I have no evidence. But each restriction placed on food for people living in destitution may mean some people go hungry. (And this excludes issues of caloric density.) I would like to see better data, but sadly, there is none.
But if I had an empty kitchen, lacked the funds to invest in bulk purchases, and had 30 minutes to cook and eat, I'd be eating very differently.
I'm not sure if you mean buying pre-prepared meals is expensive. If that's what you are saying, I agree.
But if you're stating that preparing meals (at your own place from raw ingredients) is expensive. That's simply not true, at all.