Can someone who knows more about plants and agriculture than me tell me if the Youtube channel NatureLostVault is completely full of shit or not?

https://www.youtube.com/@NatureLostVault/videos

This channel uses clickbait headlines and a probably-AI voice, and its scripts may be AI generated as well. It postulates that numerous plants have been used to feed whole civilizations in the past, but because they are not suited to capitalist for-profit production (even if the AI narrator never uses the word "capitalist"), these plants are classified as weeds. Is this true? Can we actually feed millions of people on cattails and chufa and groundnuts/potato beans and all the other stuff on this channel?