All the people she was arguing with were real accounts

What counts as a "real account"? And how exactly have you verified that they are "real accounts"? I did try to find the accounts for TheDownvoteParade as well, he is suspended, and I could find no archive of his comments.

people have said that they can find the comments on removeddit.

Which ones? The second group of comments I did manage to find, as it was linked in the first. The screenshot is accurate to that extent. However, the quoted comments (which frankly, sound most suspicious of all) are not linked, nor have I been able to find them or the threads in question. If they ever existed, they were likely deleted by the /r/Judaism moderators. I assume they did exist, because if someone in that conversation managed to point out that these comments cannot be found, this would have served less well as propaganda.

The point is not that the comments are fake, but that the individual is not what he claims he is. Most likely, he is a Stormfag-type who is posting this sort of thing to try to "prove" his pre-existing ideas about Jews. It's so ridiculously over-the-top. It's not the kind of thing that a Jew who believed this sort of thing would write, it's quite obvious to me that it's someone pretending to be.