Lie of omission or lying by omission are established notions, which also have legal meanings. The intent, I am pretty certain, is to cover this, from Wikipedia page on Lie:

Lying by omission

 

Also known as a continuing misrepresentation, a lie by omission occurs when an important fact is left out in order to foster a misconception. Lying by omission includes failures to correct pre-existing misconceptions. For example, when the seller of a car declares it has been serviced regularly but does not tell that a fault was reported at the last service, the seller lies by omission. It can be compared to dissimulation.

Specifically, a hint marked as such can never be an issue as it is explicitly disclosed the information is not detailed. An intentionally misleading hint might be a violation, but I do not see a problem with this.

Lie of omission or lying by omission are established notions, which also have legal meanings. The intent, I am pretty certain, is to cover this, from Wikipedia page on Lie:

Lying by omission

Also known as a continuing misrepresentation, a lie by omission occurs when an important fact is left out in order to foster a misconception. Lying by omission includes failures to correct pre-existing misconceptions. For example, when the seller of a car declares it has been serviced regularly but does not tell that a fault was reported at the last service, the seller lies by omission. It can be compared to dissimulation.

Specifically, a hint marked as such can never be an issue as it is explicitly disclosed the information is not detailed. An intentionally misleading hint might be a violation, but I do not see a problem with this.