Thresholds are not a problem as long as they are documented. Presumably the standard I'd neutral, and if less (say) sugar makes the product rating change, I don't see how that hurts competition. Meet the threshold, don't meet the threshold, it's up to you.

Your thesis that providing nutritional information to the public would result in industry pushback would suggest that govt cares more about corporate profits than public health.

Alas I agree with you. One feels that providing nutritional information to American consumers would be easily trumped by money.

I'm not sure such an "obvious" conclusion is necessarily a good sign of effective government.