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The truth lies somewhere in the middle. It is easy to get enough protein on a vegan diet if you eat multiple servings of high-lysine foods (legumes, seitan, amaranth, quinoa, pistachios, and pumpkin seeds) each day. But there are many vegans who are probably not eating enough high-lysine foods.
Food in the protein food group comes in the form of meat, seafood, shellfish, beans, peas, soy products, eggs, nuts, and seeds. New and inexperienced vegetarians and vegans struggle the most with this food group, since the most accessible proteins come from animal products.