If you received inactive project deletion emails on 4/30/25, you can ignore them. The projects named in those emails will NOT be deleted on 7/30/25. Some type of inactive project deletion will be implemented later this year, but you'll receive further communications before any deletions are scheduled.
Releases are based on Git tags and mark specific points in a project's development history. They can contain information about the type of changes and can also deliver binaries, like compiled versions of your software.