The EU has nutri-score which looks like this, but less information.
I quickly skimmed to the article you linked. I couldn't find anything as to whether it pertains to cooked or uncooked food?
For example, in the EU frozen pre-fried French fries have an A score (best), but that isn't correct, as no-one eats them like this. You fry them again in your home fryer.
Whereas smoked salmon is D or E because of the higher fat content, and the salt used for drying.
It's meant to be 'as prepared' but as the above notes there's trickiness in certain brands claiming "our guidelines say to prepare it with skim milk" while everyone adds ice cream.
Still while no system is perfect and there's a need to call out brands that claim it's prepared with skim milk when it's clearly not i still think it's pretty damn great.
I quickly skimmed to the article you linked. I couldn't find anything as to whether it pertains to cooked or uncooked food?
For example, in the EU frozen pre-fried French fries have an A score (best), but that isn't correct, as no-one eats them like this. You fry them again in your home fryer.
Whereas smoked salmon is D or E because of the higher fat content, and the salt used for drying.