Update: Scanned (briefly) through the recent MLID stuff.
Saying "800 Mhz is a crazy low clock speed" when talking about a dedicated handheld is like a guy who lives in a skyscraper saying that "2 doors is a crazy low number of entrances" when talking about a house. It's an unhinged statement, it's not missing context, it's missing the boat.
Nintendo and Nvidia didn't find a 12SM core out in the wilderness, shine their torches over this ancient artifact, and then pronounce "I know what clocks the Gods set for this, but I'm gonna do something wild..." They made the chip! The clock speeds and the core counts were decided together as part of a development process that didn't care about either number, but the way they interact - performance per dollar, performance per watt, performance per square millimeter.
They went with "crazy low" clock speeds, but Drake has double the number of cores of AMD's Z1 Extreme. It's almost as if the design doesn't exist to look like a desktop PC.
@Thraktor's numbers, which remain the best analysis I've seen of the situation, propose 550Mhz as peak efficiency for the entire Ampere line, and that a very large GPU would be the natural consequence of maximizing performance per watt. You go to the most efficient clock speed, and then add cores till you either run out of power budget, run out of money, or hit a weird cliff. For Ampere's design, the "weird cliff" is exactly at the number of cores that Drake has.
800Mhz implies that Nintendo had power to spare, which is wild to me, but hey, that's amazing. I find it implausibly high, but if real, that's at the point where Steam Decks "AMD advantage" disappears.
If MLID has Nvidia sources, they're not from the core Tegra team, who would understand embedded levels of power efficiency.