And as a follow on, if the president pardons someone for a crime can those harmed by it still sue the perpetrator for damages in a civil case?
Yes absolutely. Being found not guilty of a crime or being pardoned has no bearing on the evidence that exists which is presented in a separate civil case against you.
There’s no double jeopardy in a civil case - it’s a matter of if someone has a claim of damages.
It's not about pardoning, it's about what US bankruptcy trustee thinks is ok or not ok. Had this happen under Trump administration, I would assume that the trustee would not even allow such a deal to go ahead in the first place.