I can't speak for them, but adding a scoop or two of pea or brown rice protein makes it very easy to achieve any target amount of daily protein while getting a good amino ratio.
Also, per serving: lentils (?g), peas (5g), peanut butter (8g), flax meal (3g), hemp hearts (10g); and more I’m sure I’m missing.
That said, I could easily eat 3 cups of beans per day.
As to “complete proteins” mixing quinoa and oats, which each have some of the necessary amino acids, makes their combination a source for complete proteins.
> All the things in your diet are listed as "examples of not complete proteins" on that page. not quite sure what that means.
Complete proteins contain all nine essential amino acids in consistent amounts. Most of those are stuff like fish, poultry and dairy, whereas grains or vegetables usually don't contain all the needed amino acids.
So if you're on a veg diet, mixing and matching those protein sources is recommended to get you all the amino acids your body needs.
Are you on low protein diet ?