This isn't a question of interpretation. This is the question of a man who (a) quite literally sold his soul to the Nazis, and ordered his faithful to commit suicide, so that he would be permitted to flee, and (b) afterwards did everything in his power to subvert and undermine the Jews that did manage to survive the Holocaust in his relentless attacks on Israel.
I can't believe that G-d would so casually forgive this simply because he was supposedly a learned rabbi. I certainly would not worship a G-d who is so flippant about mass murder.
If the Satmar "rebbe" was still a "righteous man" because he was a Torah expert, then it could be stated just as fairly that Martin Luther (ys"vz) was also a noble Bible scholar who was simply "mistaken" when it comes to Jews.
If you don't want to agree with me, as a Gentile, that is fine, but I would at least suggest asking Chaim how he feels about him. Actually I do know what he says of him--he has brought him up on Ask JTF many times.
Chaimfan