Ponzu is an temporary as-is function that is searching for user provided Citra and Yuzu AppImages and make them available as emulators inside RetroDECK.
No we provide zero support, the the only official emulators we support for those systems are Ryujinx and Citra-core in RetroArch (as long as it is shipped as part of RetroArch).
Since the first day of our announcement on both Citra's and Yuzu's removal, we made it extremely clear that we will not provide any new: configurations, bug fixes, improvements, or any kind of support at all, for the these removed emulators. There is also a very substantial risk that future updates of RetroDECK will break the current temporary compatibility, this to be seen as a temporary as-is solution.
At the same moment we also updated our social rules to reflect that any type of discussion about these emulators will come with a warning first and then a ban.
The only recommended use case of Ponzu is the intended function as safe way to migrate to Ryujinx or the Citra-core (finish up, save and move).
Your saves and games will not be deleted, so if you decide to re-install them everything will be as you left, except for the configurations that they will reset as RetroDECK legacy defaults.