Earlier quoted context omitted.
How can you appeal the arbitration in court? Pretty sure you agree (when signing away your rights) that you will hold the arbitration result to be binding and you give up any potential court remedy. IANAL though.
I believe they were talking about an alternate world where arbitration decisions would be appealable, not the world we live in.
Granted, the appeals are unlikely to succeed, but perhaps that is because arbitration typically has an approximately fair outcome? Appeals of typical court cases aren't likely to succeed either, but we don't say that court is therefore unfair.