No, that's 100% accurate, at least when I was in school in the 90s-2000s. It actually got worse, as the old government subsidized food staples were phased out (government cheese, flour, potatoes, etc), that actually had to be cooked, and replaced with Sysco frozen products. I'm not sure whether this was actually cheaper than buying real food, or it was laziness.

Also the school breakfast programs were catastrophic, in my opinion. Again, no real food, just packaged donuts and danishes and sugar-laden cereals. It was arguably better when we had snack time instead, with milk and a bag of pretzels or Goldfish and a piece of fruit.