Since the API change RiF was still usable in logged-out mode, however, it's now consistently not loading posts anymore. They recently updated the "logged-out user experience" (see link below), which may have also been used to finally kill any RiF stragglers.
Good news is that Sync for Lemmy just released so the transition on mobile is finally easy!
Here's a temporary workaround for anyone wanting to continue using RIF or any other third-party Reddit clients. I say temporary because Reddit could break the functionality at any given moment.