It's not really specified what those power consumption values mean, but it's very probably they are labels, since there didn't exist an ampere gpu in 2021 that could do those clocks at those watts.So, the power draw we have for Switch 2 are these:
- Portable mode (2TFLOPs): GPU at 660MHz, consuming 4.2w
- Dock standard (3.4TFLOPs): GPU at 1.125GHz, consuming 9w
- Dock boost (4.2TFLOPs): GPU at 1.38ghz, consuming 12w
The original Switch, when play a heavy game, like BotW, the total consume is aroung 7W on portable. The division is more or less that:
- APU: 3w
- Screen: 4w
- others: less than 1w
Switch 2 screen, if is similar to the amazing Rog Ally's Screen, can consume something like 4 - 8w.
So, it's not impossible that Switch 2 can draw somelthing like 10 - 15w on portable mode, what is very close to what steam deck consume. If the battery is the same size than deck, the time on game will be 2.5 hour on heavy games.
That can be the low Nintendo ever done with a battery if they don't put a bigger and more durable battery or use a OLED screen.
So, what can be cheap: LCD with a bigger battery or OLED with a battery closer to what current Switch have?
If they are labels, they could just as easily be labels for Drakes total power consumption than for just the gpu. But again, we don't have full context.