Well, hope no one tries to deploy overlocked Raspberry Pi hardware in production... especially for kiosk style applications where they're in a metal box in the sun.

They're unstable enough at stock if taken outside an air conditioned room.

The post is about a microcontroller that sips a fraction of a Watt under sane conditions. Cooling its CPU cores is not a problem for real-world applications. You have to bypass the internal voltage regulator crank up the voltage even more before heat becomes an issue.

This is about the Raspberry Pi Pico 2 (based on the RP2350), not the original Raspberry Pi.

And is it better with bad cooling?

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It's better with absolutely no cooling. It doesn't even consume (and thus dissipate) 100mW flat-out.

Yes.