Listings on the Chinese 3C battery certification database seemingly confirm the existence of the Samsung Galaxy S20 5G (listed as the SM-N9810) and the Galaxy Z Flip 2 (listed as the SM-F7070). Details have now emerged about battery capacity for these two devices.
https://www.notebookcheck.net/Purported-Samsung-Galaxy-Note-20-SM-N9810-and-Samsung-Galaxy-Z-Flip-5G-SM-F7070-show-up-in-3C-battery-certification-database-battery-details-emerge.469264.0.html