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That is pure BOLLOCKS.
Earth's core has been cooling gradually for 4.5 BILLION years. Lord Kelvin made the first educated guess as to the age of the earth based on that very principle (but he was off a few orders of magnitude because he was ignorant of radioactive decay and its effects). To not do so would be a violation of the 2nd Law of Thermodynamics.
Which only applies to closed systems, which the earth is not because it receives energy from the sun (on the order of 320×10^29 joules/day). But the Man-Made Global Warming crowd would sooner hare-lip the Pope that admit the sun, not MMGW, actually controls earth's temperature.
Like this?????