Comment by Kayvanian

Pre-Oct 2026 content will always be licensed under CC, they can't revoke that. The license change applies for submissions moving forward.

My understanding is that anything submitted was also dual-licensed to allow the site to freely use your content however they wish (like most sites out there that accept user content). So they can, for example, distribute the old data without the CC license statement, even if the content is CC-licensed.