Yes, simple curved geometry is supported for Detailed Revit models but currently not for Mass models. Support for curved geometry in Mass models is in development and will be included in a future version. As a workaround, curved areas in Mass models may be faceted or segmented to provide surfaces suitable for the application to read.
Where geometry is more complex, all areas may not be analysed fully and Users are advised to exercise caution with these types of models. Curved geometry may not be assigned Surfaces or be provided with results by Guardian Glass for BIM.