Thank you so much for your bug report today. I have added support for the automatic replacement of core/comments-query-loop block types and tested on Extendable theme with positive results.
1.0.12 should fix the issue you’ve experienced.
If you run into any further issues please feel free to let me know and I’ll look into them within 48 hours.
The plugin, how it is currently built, should automatically replace the core WordPress comments system with the Radle comments system by toggling this setting here to use Radle instead of the default WordPress comments system:
However, I took a look at the theme you are using and tested it and figured out that Radle is lacking in support for core/comments-query-loop and instead only intercepts core/comments for block based themes.
I’m working on a fix now and should have an update out before EOD.