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You should try to build a chamber that sprays liquid nitrogen or other cryogenic liquids at the food.
Idk, good luck.
There is a drink chiller that chills drinks in about a minute. You could use the same idea for other things.
The Chill-O-Matic is smaller, cheaper and probably easier to clean as it doesn't seem to have tubing.
The design of that machine in your link is a lot of overkill for something simple.
In beer brewing there's a point where you want to cool your beer down as quickly as possible.
A chiller is dropped into the just cooked wort. (wort is the beer before fermentation).
It goes from steaming hot to room temperature very quickly.
It's just a spiral pipe that you run cold water through.
Sounds like you need something like that for a potato.
I present the Macro Wave!
Fridge, well. But now I'm wondering if that would be possible with electromagnetic radiation somehow. Would it be possible to direct infrared waves away from a closed chamber, making the inside cooler? Like a semipermeable membrane in shoes with water vapor?