I don’t think so, which is why its hard to define. Of the definition, I think most of the last part is agreeable. but like you said, the part I have a problem with is thickeners, and flavor enhancers as theyre kinda too broad. MSG for example is a naturally occurring flavor enhancer. And you can debate on adding more of it is a potentially bad thing or not (hard to get hard scientific evidence that its fully bad).

additive colors are already banned in most states so that definition is mostly redundant.