Correct me if I'm wrong, but the original author was not arguing that we should eat meat for our protein.
They were suggesting that if you get your protein from plant sources, you should make sure to hit a complete amino acid profile and you should understand that digestibility is also lower for plant-based proteins.
They were suggesting that if you get your protein from plant sources, you should make sure to hit a complete amino acid profile and you should understand that digestibility is also lower for plant-based proteins.