User blog comment:MisterWoodhouse/A change to Shared Help on the Unified Community Platform/@comment-24171918-20200706191546/@comment-24006128-20200706192400

The pages will redirect on the migrated wikis, so the URL parameter will be needed if a migration occurs before the custom content can be retrieved. It's why we added the code to be able to perform a post-migration retrieval (AKA the "escape pod").