Fluffychat’s changelog for v0.30.0 has this:
Version 0.30.0 will be the first version with arm64 support. You can download binaries from the CI and we will try to publish it on Flathub. Together with the new Linux Desktop Notifications feature, this might be interesting for the Librem 5 or the PinePhone. Sadly I don’t own one of these very interesting devices. If you have one, I would very like to see some screenshots of it!
I wonder if this means that it could be made to work on the upcoming 64-bit support in SailfishOS 4 without Android app support (just flatpak/libhybris)?