But other people might make similar incorrect comments, better that your comment with the reply that makes a correction float to the top (for people who sort by upvotes). The best solution is probably editing if you have the time and upvoting the reply. Similarly I’ll upvote something incorrect if I reply to it but downvote if I don’t have the time to reply.
Basically every single whole food has all 9 essential aminos, the incomplete protein thing is a half truth. It is true some foods have an imbalanced amino profile but it’s a complete fabrication that no plant foods are good enough. Many pulses, nuts, seeds, and vegetables will get you the recommended amount of aminos if you exclusively ate that singular food. For some examples pinto beans, peanuts, sunflower seeds, spinach. Even many grains like buckwheat and quinoa will get you there, just not wheat, the most commonly eaten one.
But I also find the term “nutritionally complete” to be a misnomer for something that simply has all the required aminos in the right quantities. Your body needs more than amino actions to function, there are many more known essential nutrients as well as nutrients that aren’t essential but healthful, so it’s best to eat a variety of things, and potatoes with dairy definitely does not satisfy the bill. Looping back to spinach though, it’s an example of a food that might be as close to nutritionally complete as possible, perhaps Popeye was on to something.