From what I can tell, the evidence here is a small crop of a screenshot with an e-mail address and a name on it, but one which has no context or source attached to it, so it could come from absolutely anywhere. There's Instagram, Tumblr, and DeviantArt accounts tied to this name and address, but again, it's not clear from the information in this thread as to where that name and e-mail is actually from.
There's some screenshots of some Twitter posts posted on 4chan (and if you look at where they are posted, they are incoherent schizo posts with no worthwhile information or provenance attached to them), but with the names covered and no archive link, and then
an archived Tweet by different VTuber named Yuni Luna. If they're supposed to be the same, then that information isn't presented or clarified here. In the archived 4chan thread, that same crop is posted, when someone asks where or when this is from, this is the response:
View attachment 17783
This person could have plain made it up for all that it matters. Hell, this could even be Pipkin Pippa herself planting false evidence.
If Nicolette Pinder actually is Pipkin Pippa, then I don't think this thread has proven that to be a fact, or even provided any evidence that vaguely suggests that to be the case.