rpmfusion has been working fine here. it's not rpmfusion that's broken. It's just how the keys are installed that's the problem.
When mine first updated from rawhide to the regular repo, I got that error here, but it seems that once it fully updated the packages, it worked fine. But, I did also have the non-rawhide packages already installed, and had the repos disabled.
Try removing the rpmfusion packages and reinstall them.