I'm not a "having conversations with 'pg over email" kind of guy, but I've found him pretty responsive on "it doesn't look like this person should be banned" mails. Next time, you might find it less effortful to bang out a quick mail to pg@ycombinator.com to fix stuff like this.

(I don't know what the deal is with accidental hellbanning, but it seems to happen with some regularity).

I mailed him already for this user, though.