Absolute joke. Clown town. Amateur hour.
https://www.tomshardware.com/news/intel-28-core-cpu-5ghz,37244.html
We tracked down the test system the next day and did the full deep dive analysis in our Intel's 28-Core 5GHz Processor And Test System Breaks Cover article. We learned that Intel had in fact used a water chiller to push the processor to 5GHz, which confirmed our suspicions.
It certainly wasn't a garden-variety chiller, though. The industrial one-horsepower Hailea HC-1000B can pull a peak of 1000W alone, which is a shocking amount of cooling power for a processor that Intel positioned (by omission) as a chip coming to market at 5GHz. We also learned that the test system required a 1300W power supply, so total system power draw for the demo could stretch up to 2300W. In fact, the hideous amount of juice required to power the demo system prevented our contacts from showing us the performance demo privately: The area we were in simply didn't have enough dedicated circuits for the task.