This is a great motivational pep-talk that encourages people to try growing some of their own food. Which is a good thing. Even if all it teaches them is an appreciation of the process, that's a good thing.
If your kid's answer to the question, "Where does food come from?"
Is, "The grocery store."
You might want to consider doing a garden project with them. Just so they have that experience. Even if they don't grow anything else for years, they will at least have a basic understanding of how it works.
Because Jessica is absolutely right that the era of "cheap and plentiful food" is just about over. The Climate Crisis that is unfolding now is going to change your diet for the rest of your life.