The claim is that a journal published a rewritten chapter of Mein Kampf and that journal is therefore bad.

I don't think that is a reasonable argument. It depends on what the chapter was talking about. If it made a big point about Jewish conspiracies and keeping the American people ethnically pure then that is a problem. If it was 1,000 words complaining about vision-less politicians then what is the issue?

If we are talking in the context of submitting it as a paper to a journal, then a problem is plagiarism. If we are talking about "does hitler have some non-genocidal ideas?" then like I said, not sure I care. "How was hitler so persuasive?" Interesting. "How did hitler outmanuever his opposition domestic and foreign" . Interesting.

But yes you have a fair point that just because Hilter said X doesn't automatically invalidate X. The old "the nazis drank milk so dont drink milk" fallacy