It is, I was the one that advised avoiding it though, not
@NergalsNest.
In the demo several of the characters do not have blackmail routes, potentially because there's not enough "isblackmail" checks in the code. You're also right in that the blackmail dialogue is all basically corruption dialogue. If you want to at least play the corruption routes you could try using my patch I've posted in this thread as I think I've fixed most of the issues in purity/corruption routes, I didn't fix the blackmail routes because that's too much work for something that I'm not into anyways.