
What's your issue with using sodium/calcium phosphate over sodium citrate? They all perform the same function in American cheese. Toward the bottom of this page there's a table of ingredients found in American cheese, all three are included in it.
Saying Kraft Singles aren't cheese because the FDA's legal definition categorizes it as something more specific puts you in the same category of people that insist that tomatoes aren't vegetables because botanically they're defined as fruit. Technically correct, but overly pedantic and unproductive when looking at things through a culinary lense.