So that's a lot more helpful in explaining why someone might be suspicious of his touting her arrival.
But it still sounds more like a fanboy than a paid shill.
If I cared, I guess I would ask him is he using mutiple.sock puppets and why? But tbh I don't care that much. The key fact for me is that her other reviews are generally consistent with his review -- which was informative enough that I get why some people would be excited. I doubt I would prioritize her over other choices given the lack of English. (Takeyas review from PP is similarly useful although not as detailed on the whole squirt thing.) Admittedly, I haven't bothered to look around for old reviews from the NJ and PA boards.
If you really believe he is affirmatively harming people using multiple accounts, I guess you can report him, make your case, and let the mods deal with it. But until then, if his style bugs you, I think you can just mute/ignore his username(s).