User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-47066993-20201028130731/@comment-44807868-20201028133804

Please see the notification on that wiki. "Attention: We have migrated your community and all of its content onto new wiki software. Find out more in this blog post. Article Comments and/or Message Walls are still being migrated and content will be incomplete. We will notify you once the migration completes."

The article comments are still under process of being migrated. So don't worry, they'll be back soon once the migration is completed! :)