If you're referring to what's under the Genre section on the OP, that's generally what is put on a game at initial release. I'm pretty sure they get updated sometimes, but by and large I don't generally notice those keeping current as later releases come. From the game overview, "Radiant is an 'cest harem game", so this definitely has that option. However, normally a game is only tagged with current content, not with planned content. Not a single girl knows the MC is potentially getting intimate with / dating others, so I don't think the tag should be applied right now. But it for sure will have harem as an option.