I think it's unlikely if the content is benign and it's not guaranteed anyways. But if the person is posting illegal or very graphic content, and the company k

I think it's unlikely if the content is benign and it's not guaranteed anyways. But if the person is posting illegal or very graphic content, and the company knows you unbanned them, I think it would raise questions like "how do you know this person" or "what made you trust them?". Which you'll have trouble answering if all you have is their name, email, and the sparse information they gave for why they should be unbanned. You'll argue "this person hid that side of themselves from everyone" but at minimum it calls your judgment into question, and if the company is aware of this kind of service, they'll probe for more information. Also if someone uses this service repeatedly disguising themselves as different people, it will raise questions why different internal employees kept unbanning them. That would be much more suspicious.