That's the common belief afaik. Pigal gogo, silvero, and nb are all the same person. Misaki Rindou is someone who's been actively doing stuff against silvero. There are also, like, 3 or so fake silvero accounts like shilvero and si|vero made by various people to mock the real silvero.
Given the nature of the thing, I doubt silvero is a bot. Probably just a troll. And the best way to kill a troll is to ignore them. Plus, I'm pretty sure blargle is already aware of what's going on. He might be able to implement IP bans or something but that's on him. There isn't much point in you or I "investigating", except to kill time, because there's not much you or I can do. Unless you want to make another fake account, or spam her youtube page, or w/e.
Really, the best thing to do is: 1) If silvero uploads an edited version of a script you made, report it to Blargle. 2) If pigal gogo uploads a video of a script you made, or a script silvero "made", report it to youtube. 3) Don't give her the attention she wants.