Yup. #2 is the traditional meaning. #1 is the misinterpretation that usurped it. See
https://en.wikipedia.org/wiki/Begging_the_question
Right. Everybody needs to eat.
It's just that herbivores can synthesise some that carnivores typically can't.
Google did say, "Cows and other herbivores cannot synthesize all the amino acids they need". Not that I think that Google is the last word in everything but at this point all that I'm certain of here, from what you and Google have said, is that cows and other herbivores either do or don't synthesis all the amino acids they need. Didn't find any literature to clarify. Only that humans synthesis 11 of the 20 amino acids and refer to 9 "essential" amino acids that humans can't synthesis. And that ruminants ferment cellulose to utilize amino acids deep in the cellulose. However, no suggestion that cellulose contains all 20 amino acids.
Did find from Google plant sources that contain essential amino acids:
The 9 Essential Amino Acids:
Sources of Leucine: cheese, soybeans, beef, pork, chicken, pumpkin, seeds, nuts, peas, tuna, seafood, beans, whey protein, plant proteins, etc.
Sources of Isoleucine: soy, meat and fish, dairy and eggs, cashews, almonds, oats, lentils, beans, brown rice, legumes, chia seeds.
Sources of Lysine: eggs, meat, poultry, beans, peas, cheese, chia seeds, spirulina, parsley, avocados, almonds, cashews, whey protein.
Sources of Methionine: meat, fish, cheese, dairy, beans, seeds, chia seeds, brazil nuts, oats, wheat, figs, whole grain rice, beans, legumes, onions, and cacao.
Sources of Phenylalanine: milk and dairy, meat, fish, chicken, eggs, spirulina, seaweed, pumpkin, beans, rice, avocado, almonds, peanuts, quinoa, figs, raisins, leafy greens, most berries, olives, and seeds.
Sources of threonine: lean meat, cheese, nuts, seeds, lentils, watercress and spirulina, pumpkin, leafy greens, hemp seeds, chia seeds, soybeans, almonds, avocados, figs, raisins, and quinoa.
Sources of tryptophan: chocolate, milk, cheese, turkey, red meat, yogurt, eggs, fish, poultry, chickpeas, almonds, sunflower seed, pepitas, spirulina, bananas, and peanuts.
Sources of valine include: cheese, red meat, chicken, pork, nuts, beans, spinach, legumes, broccoli, seeds, chia seeds, whole grains, figs, avocado, apples, blueberries, cranberries, oranges, and apricots.
Sources of Histidine: red meat, cheese, white meat and poultry, seafood, soybeans, beans, legumes, chia seeds, buckwheat, potatoes.