Not that it's bad. For me, it's actually very useful, I just find it mildly amusing that an app for managing AppImages is packaged as a Flatpak, despite the two formats being widely known as competitors*.
* Okay, most people (including me) would say that the two formats are for different use cases and aren't directly competitors, but for the eyes of a lot of AppImage purists and Flatpak critics, they are.