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The question should be posed on a more global scale.
"What is the point of having checking roles if they are not allowed to hint at their information in any way?"
1) There is psychology involved. If someone is exposed, they reveal the information.
2) There are notes. If someone checks, they write it down in a newspaper.
3) There is a classic scenario. The commissioner checks, and the commissioner kills.
4) But in our case, it turns out to be a "role for one person," not "for the town." They check and then sit on their information. And God forbid they even voice an opinion without providing arguments, "quotes from the accused player's posts that supposedly expose them, or excerpts from the newspaper."
Think about it. If the checking role doesn't leave any hints about nighttime information in its posts, how is it different from a regular town member without any special role? What is the purpose of the role? Of course, hints can be different, but that's why there is a Game Master who distributes modkills when necessary.