Changing the title of an issue, presumably so it doesn't show up in search results? Deleting the body of the issue? Not leaving any explanation? Yeah, that doesn't seem normal to me. Can't say I approve.
it wasn't purged, per say. if you click "edited by maxtaco" on KirtiRamchandani's first comment, you get a dropdown to select the versions, and you can still find the original text.