Exactly. These were foods for US "latchkey kids" in the 1970s and 1980s, not "midcentury" (think Mad Men early 1960s) foods. During this time the rise of having two working parents (or because of rising divorce rates, a single working parent) combined with inflexibility of employers to allow "flex time" as they often do today, meant that many children often had to prepare their own meals. So simple frozen foods were common as even a grade school child could prepare them.
My mom worked a split-shift (3 hours in the morning, and 5 hours in evening Wed-Sun). My dad was in the army and was deployed to far-away lands for a significant portion of my life between 8-16 years old. My mom hired a couple of "minders" - but the first one made a baby in our bathroom with her boyfriend, and the second one did nothing but watch TV and sneak some shots of whiskey between TV shows (on the three networks then available).
Long story short, I was left to my own devices a lot. My mom tried to make dinner for me - but sometimes (being a growing boy) I was just really hungry - so chef-boy-r-dee pizza was a staple - at least until I learned that one could phone in an order for pizza and have it delivered! Now we were cash-poor, so when wanted spending money, I'd have to go house-to-house to ask if they needed their lawns mowed. I'd get somewhere between $5 or $10 depending on the lawn size and would use the money for pizza delivery once or twice a week.
Pretty amazing to think about it - a kid between 10-15 years old being left alone for hours a day and having to go house-to-house to mow lawns for extra money! (let's not forget it was the 70s so things like bike helmets, seat belts and non-smoking areas didn't exist either).
Same here. But the meaning of a "latchkey" kid is a kid who has to unlock their door to get in their home (because nobody is there when they get home from school) -- this is independent of the concept of a "free range kid" (who may or may not have a parent at home but are just allowed to roam)