The atkins shakes are fine for me, even been a pretty major staple of Keto for me for years due to the various stuff they bring with it (potassium is a big one, protein and fat, etc).
“Real food” is great and all, but we’re not all that gung ho about it, and not everything that isn’t “real food” (it’s actually all real, I swear I’m not just imagining this stuff) is going to kill you or even make your health worse than it already is (perhaps not get you to ‘optimal health’, which is a high bar, but the jury is still out on that as well)