If your conference will dis-invite / "de-platform" people based on their opinion about topic {foo}, you are in fact hosting a conference about {foo} , regardless of what your name, official agenda, or spokespeople say. Kudos to LambdaConf for actually keeping on focus in the face of dissent.
Well, this works the other way around too, right? If you invite, or accept applications from, someone who is primarily noted for {bar}, then whatever your name, official agenda, or spokespeople say, you are now hosting a conference tolerant or supportive of {bar}. You seem to be making a declaration that acts are inherently political, and I'm all for that. It's just that the standard works both ways.
So not in this case.