Because the GitHub releases section is no longer being updated, I see no point in keeping it around providing outdated information.
From what I'm seeing in the articles linked below it should be fairly simple to clear it out; you can even delete all releases at once if you go with the GitHub CLI method.
Using GitHub CLI: https://stackoverflow.com/questions/75237631/how-to-delete-all-releases-and-tags-in-a-github-repository
Using GitHub website: https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository#deleting-a-release
