If you take him at his word, but he did ask for people
to give him the info publicly. I think if mods had done that, and used
the word "dox" explicitly your case for hypocrisy would be sound... or
if he had kept to PMs and they still banned him.
He said to email it to him. The email address is now censored.
He still asked for the info publicly. Show me mods asking for doxing publicly and I'll agree. I don't think people should be creating secret conspiracies to dox people, but at least that wouldn't have the same chilling effect (until of course they start the blackmail).
So why is “extravagant lying,” which objectively was not even the case
here and fallout thread harassment even mentioned in the ban?
That is false, you cannot prove it is not the case and in my opinion the balance of evidence points to an extravagant lie.
I said people shouldn't be banned for something so difficult to prove as intention, but you certainly haven't proved the inverse; that he was totally honest in what he said. If he was, he has a screw loose.