Mio could have just replied under the art asking for some way to DM them, or just outright bring up the art during a stream and say that she wants to contact the artist.
Going through her socials to deduce who she is and then setting up a trap for her is creepy as shit. Tha fact that they point this out and then go "well we don't have bad intentions, it's public info and she will be happy to meet us, so it's okay for us to track down this person" is even worse. That's the same dogshit justification every doxxer who isn't an outright hater uses.
Like, maybe I'm overreacting a bit, but it's weird to me that an author who is clearly into vtubers would depict this kind of shit in any sort of positive light.