With no replies doesn't seem to function

Hey guys,
Beaut plugin concept. I jumped on it as soon as I saw it.
Still playing but the Missing Reply section doesn’t seem to show anything, despite there actually being comments that haven’t got replies to them.

That was the area I was most looking forward to see working.
Thoughts?

https://www.ads-software.com/extend/plugins/comments-not-replied-to/