So we've had multiple independent sources confirm the same exact specs. These specs are also confirmed by the SDK and the hardware breakdown of a leaked Switch 2 motherboard. Developers will have to know which resources are available to them before they release their games, so obviously the specs listed as available on final systems in the SDK will reflect that reality. Otherwise, how can developers develop games for hardware they don't know the specs of?
These are the specs that Digital Foundry confirmed from their sources who have access to the SDK.
The unknowns/lingering questions are: "what does CPU [and GPU] clock maximum" mean here? Are these modes available for games? Are all Switch 2's using down-clocked LPDDR5x or are only some of them using it, with other SKUs using appropriately clocked LPDDR5 to get the same effective bandwidth?
