Not neccessarily, it could mean that the post won't be visible on the home page, but visible on other pages within the site, nothing black hat about that!
There are a few hacks available in Wordpress to do this. One such hack is to create a category called "hidden", and change the wordpress loop on the main page so that it displays only posts not in the hidden category. Browse the codex on how to do this.
Somebody will have a better idea though
