I suspect me-yeah actually means you could use a Thermoelectric Generator on the CPU: https://en.wikipedia.org/wiki/Thermoelectric_generator
A couple of quotes from the wiki page:
The typical efficiency of TEGs is around 5–8%.thermoelectric generators serve as poor heat sinksGood luck running your CPU at 200 °C to power a single fan....They are only economical when a high temperature (>200 °C) can be used and when only small amounts of power (a few watts) are needed.