Shouldn't they list them by revenue? That way, the brands most likely to be familiar to any given consumer would be easiest to spot. General Mills has many reasons to prefer that people don't form their own independent associations and opinions on their overall business, but these also boil down to growth, revenue and profit. The design of their website reflects this perfectly.
There are many ways to be dishonest and there is great value in studying them. Humanity's progress depends on learning from the evil that is done. This is essentially like building a muscle; strain is required.