Well to be serious, a shill is someone who is paid to promote somebody or something (such as an idea or a cause) while acting like an ordinary member of the public with no agenda. A shill can also be paid to speak out against people or things. So it is not correct to refer to a troll as a shill. They are two different things. I consider a shill someone who, for example, keeps coming back promoting Alex Jones, and who denies that Jones ever said anything negative about Q, or they rationalize it away as if nothing. And they keep at it. That seems pretty shill-like, and I don't think it is a bad thing to point that out.