I would have to agree with you, David. That's not an ingredients list, that's reads like someone giving me a 30,000ft summary of the contents as they are reading, "Some cereal grains, some byproducts, some oils, some legumes"
What cereal grains? What byproducts? What Legumes?
I'm also highly suspicious, generally speaking, of these lines like Harrisons and Psittacus, with specific formulations such as "High Protein", "High Mainentance", "High potency","Mainentance"....
When you get into such specialized formulae, it almost comes to a point you need a prescription from a vet to actually know what you should be feeding. High energy food or High Protein food are clearly specialist feeding systems that are designed for very specific purposes, and shouldn't be fed to just any bird. Yet people grab the wrong formulation for them daily.