Earlier quoted context omitted.
Regulations, when they exist, are also deceiving. See how, for example, you're allowed to claim your stuff contains zero calories when it has below a certain amount of calories per some amount of content.
TicTacs, for example, are pure sugar, but the serving size is (claimed to be, at least) a single one, which conveniently weighs 0.49g.
I suppose it's "correct" in the sense that 0.49g rounded to the nearest gram is 0g. For reference, a sugar cube is ~4g, a can of coke has about 32g of sugar, and daily recommended intake for "free sugars" is about 30g, so their ~0.49g of sugar amounts to ~1.5% of daily intake, and amounts to about 2 calories per TicTac. That's not a whole lot, but it's not the "0" claimed on the package, either.