YouTuber Moore's Law is Dead has confirmed that AMD's upcoming RDNA2-based RX 6X50 refreshes will be based on the 7nm manufacturing node. Coreteks adds that the Radeon RX 6950 XT will be launched in mid-April and that the Radeon RX 6850 XT and the RX 6750 XT do not exist.
https://www.notebookcheck.net/AMD-Radeon-RX-6950-XT-April-2022-bound-graphics-card-will-use-the-same-7nm-manufacturing-node-as-the-only-RDNA2-SKU-to-be-refreshed.597642.0.html